대부분의 지원 리더들은 여전히 잘못된 논쟁으로 밀려나고 있습니다. 2026년의 진짜 질문은 AI가 인간보다 나은가가 아닙니다. 어떤 대화가 인간의 시간을 필요로 하고, 어떤 대화는 즉시 자동화되어야 하며, 고객이 짜증내기 전에 어디에서 인계가 이루어져야 하는가입니다.
이 구분은 중요합니다. 왜냐하면 AI가 서비스 기준을 변화시켰기 때문입니다. 고객들은 이제 자동화가 존재한다는 것을 알기 때문에 즉각적인 첫 응답을 기대합니다. 그들은 여전히 문제가 복잡하거나 비싸거나 감정적인 경우에는 판단, 안심, 그리고 책임을 기대합니다. 모든 것을 인간에게 맡기면 과도한 비용이 발생합니다. 모든 것을 AI에게 맡기면 비용을 절감할 수 있지만, 충성도가 떨어질 때까지입니다.
나는 2026년 4월 10일에 이 기사에 대한 숫자를 위해 공개 가격 페이지와 벤치마크 보고서를 확인했습니다. 수치가 HubSpot, Intercom 또는 Zendesk와 같은 공급업체에서 나온 경우, 이를 보장보다는 계획 벤치마크로 간주하십시오. BLS 또는 LiveChat과 같은 더 넓은 벤치마크에서 나온 숫자는 기준 모델링에 더 적합합니다. 이 프로젝트의 구축 측면이 여전히 필요하다면, 여기에서 마친 후 이 고객 서비스 챗봇 설정 가이드를 시작하십시오. 이 글은 버튼 클릭 튜토리얼이 아닌 운영 결정에 관한 것입니다.
내 규칙은 간단합니다. AI는 속도, 일관성 및 반복성을 가져야 합니다. 인간은 판단, 예외 처리 및 신뢰 회복을 담당해야 합니다. 이 기사에서 나머지 모든 것은 그 아이디어 뒤에 있는 스프레드시트와 라우팅 논리일 뿐입니다.
2026년 인건비가 급여 라인보다 더 비싼 이유
지원에서 가장 쉬운 예산 실수는 임금을 전체 비용으로 간주하는 것입니다. 그렇지 않습니다. 인간 상호작용은 급여 간접비, 도구 비용, 일정 공백, 마무리 작업, 대기열 관리 및 실시간 지원이 유지해야 하는 서비스 약속이라는 기본 사실도 포함됩니다.
미국 노동 통계국은 현재 고객 서비스 대표의 중간 급여를 다음과 같이 나열하고 있습니다. $20.59 시간당. 계획 수치로는 여전히 너무 낮습니다. 비즈니스는 급여만 지불하지 않기 때문입니다. 세금, 소프트웨어, 감독 및 운영 간접비를 보수적으로 추가하면, 적재된 시간당 비용은 약 30% . 이는 합리적인 미국 기준이며, 자신의 적재된 지역 급여로 교체하면 영국 팀에 유용한 공식이 됩니다. 팀이 더 고위직이거나 다국어를 구사하거나 규제가 있거나 24시간 운영되는 경우, 실제 숫자는 더 높아질 것입니다. $26.77. LiveChat의 현재 고객 서비스 벤치마크는 이 시간당 숫자를 상호작용 비용으로 변환하는 데 도움이 됩니다. 보고서에 따르면 평균.
84.1 채팅을 하루에 에이전트당 하루 에이전트당 84.1개의 채팅, 평균 8분 25초 채팅당, 평균 대기 시간은 4분 18초, 그리고 대기 중 이탈률은 27.4%. 이는 인건비를 계산하는 두 가지 다른 방법을 보여주기 때문에 유용하며, 둘 다 중요합니다.
| 인간 지원 비용 모델 | 수학이 작동하는 방식 | 채팅당 예상 비용 | 포착하는 것 |
|---|---|---|---|
| 볼륨 기반 바닥 | $26.77 로드된 시간당 비용 x 8시간 근무 / 84.1 채팅 | $2.55 인건비, $49 팀 좌석이 할당된 경우 약 $2.58 | 정상적인 동시 처리로 많은 채팅을 처리하는 바쁜 상담원 |
| 기간 기반의 엄격한 모델 | 8분 25초 x 로드된 시간당 비용, 추가로 20% 마무리 버퍼 | 소프트웨어 할당으로 약 $4.54 | 더 어려운 채팅, 채팅 후 작업 및 낮은 동시성을 위해 더 현실적 |
| 복잡한 인간 사례 | 15분 문제 x 시간당 비용, 추가로 20% 마무리 버퍼 | 재연락이나 관리자 검토 전 약 $8.06 | 청구 분쟁, 계정 문제, 에스컬레이션 또는 맞춤형 문제 해결 |
그것이 진짜 비용 이야기입니다. 간단한 라이브 채팅 대화조차도 보통 중간-$2s 와 중간-$4s 사이에서 발생합니다. 사례가 어려워지기 전까지. 환불 예외, 화난 고객 또는 정책 우회에 도달하면 인건비가 빠르게 증가합니다. 문제는 인간이 어떤 추상적인 방식으로 비쌉니다. 문제는 너무 많은 팀이 인간의 판단이 필요하지 않은 작업에 대해 인간 요금을 지불하고 있다는 것입니다.
임금 항목 뒤에 숨겨진 두 번째 청구서도 있습니다: 커버리지. 라이브 지원을 제공하는 순간, 고객은 누군가가 대기하고 있기를 기대합니다. 귀하의 사이트, 메신저 인박스 또는 앱 채팅이 도움을 약속하지만 대기하게 만든다면, 대기열은 제품 경험의 일부가 됩니다. 그래서 인간 지원 비용은 단순한 인건비가 아닙니다. 그것은 기대 관리 비용입니다.
AI 챗봇이 인간 상담원을 공정하게 이기는 곳
나는 봇이 모든 곳에서 인간을 이긴다고 생각하지 않는다. 그들은 몇 가지 카테고리에서 확실히 인간을 이기지만, 그렇지 않다고 가장하는 것은 계획을 더 악화시킬 뿐이다.

AI는 즉각적인 첫 응답과 24/7 커버리지에서 승리한다.
봇은 오후 2시, 오전 2시, 주말, 공휴일, 점심 시간에도 응답한다. 인간 상담원은 누군가가 배치되어 있고, 이용 가능하며, 이미 다른 두 개의 스레드를 처리하고 있지 않을 때 응답한다. Zendesk의 CX Trends 2026 보고서에 따르면 소비자의 74%가 이제 AI가 존재하기 때문에 24/7 서비스를 기대하고 있다.. 그 하나의 숫자가 전체 서비스 디자인 문제를 변화시킨다. 고객들은 더 이상 당신을 같은 카테고리의 다른 비즈니스와만 비교하지 않는다. 그들은 기계가 즉시 응답할 수 있다는 사실과 비교하고 있다.
AI는 반복성, 일관성 및 정책 회상에서 승리한다.
시간, 배송 창, 예약 링크, 매장 위치, 반품 정책, 청구 날짜, 비밀번호 재설정 지침 및 표준 자격 질문은 봇이 소유해야 할 정확한 종류의 작업이다. 훈련된 봇은 피곤해지거나 정책을 잊거나 대기열이 길어져서 위험한 답변을 즉흥적으로 하지 않는다. 당신의 지식 기반이 깔끔하다면, 봇은 보통 같은 질문에 대해 스트레스를 받는 인간 상담원보다 더 일관성이 있을 것이다.
AI는 급증 처리에서 승리한다.
인간은 선형적입니다. 볼륨 급증은 그들을 무너뜨립니다. 봇은 프로모션, 장애, 휴일 또는 캠페인으로 인한 갑작스러운 급증을 흡수하는 데 훨씬 더 능숙합니다. 추가적인 일상 대화의 한계 비용은 다른 근무 교대를 채우는 것과 비교할 때 미미하기 때문입니다. 이는 대부분의 리더들이 인정하는 것보다 더 중요합니다. 지원 수요는 부드럽게 도착하지 않으며, 폭발적으로 도착합니다.
AI는 일상 해결당 비용에서 승리합니다.
현재의 공개 가격 모델은 격차를 상당히 명확하게 보여줍니다. MessengerBot Pro는 30일 기준 49.99입니다. 현재 공개 가격 기준으로. 1,200 봇이 처리하는 대화가 월 기준으로, 대화당 약 0.04입니다.. 검토 및 조정을 위해 월 4시간을 추가하고 동일한 인건비로 계산하면, 효과적인 비용은 여전히 대화당 0.20입니다. 고정 요금 SMB 설정에서.
Outcome-based AI is more expensive, but still usually cheaper than a human on repetitive work. HubSpot announced on 2026년 4월 2일 that Customer Agent moves to 해결된 대화당 0.50달러로 이동할 것이라고 발표했습니다. 인 2026년 4월 14일. Intercom prices Fin at $0.99 per successful outcome. Those are not microscopic numbers, but they still compare well against human support once your human cost per interaction is sitting in the $2.58 to $4.54 range.
AI Wins Only When the Source Material Is Good
This is the honest catch. AI is not magical. It wins when the question is common, the answer exists in approved content, the tone is predictable, and the business can define a clean escalation rule. If those conditions are not true, the bot stops looking smart very quickly.
| Query type | Why AI usually wins | Main watch-out |
|---|---|---|
| Order status and delivery questions | Fast, repetitive, rules-based, often after hours | Needs accurate backend data, not guesses |
| Booking, appointment, and scheduling questions | Structured flows reduce back-and-forth | Escalate exceptions and reschedules quickly |
| Pricing and plan basics | Instant answers keep buying intent warm | Do not let the bot invent discounts or custom terms |
| FAQ and policy retrieval | Consistency is usually better than human recall | Bad source content creates bad answers |
| Intent routing and data capture | AI can collect order numbers, emails, screenshots, or issue type before handoff | Do not ask customers to repeat the same information later |
One more thing worth saying clearly: serious support automation is not a 가입이 필요하지 않습니다. category. That language belongs to consumer AI demos, not production customer service. Real support bots need saved context, permissions, routing rules, and reporting. The products that offer real business value also require real setup.
Where Human Agents Still Outperform AI in Ways That Matter
Humans still earn their keep where the answer is not just factual, but situational.
Humans Handle Ambiguity Better
A person can spot that the customer is really asking two questions at once, or that the visible issue is not the real issue. Bots are improving, but they still struggle when context is incomplete, contradictory, or buried inside a long explanation. Humans are better at sorting that out without sounding mechanical.
Humans Repair Trust Better
When an order is late, a payment failed twice, a subscription renewed unexpectedly, or a customer is angry in a very human way, the goal is no longer only resolution. The goal is recovery. That is where empathy, accountability, and discretion matter. Customers do not want a bot telling them it understands their frustration when the business just caused the frustration.
Humans Own Exceptions and Judgment Calls
Refund exceptions, goodwill credits, policy overrides, account-security decisions, fraud concerns, medical or legal edge cases, and high-ticket consultative sales still belong with people. AI can tee up those cases, collect the facts, and route them correctly. It should not be the final authority unless the business is genuinely comfortable with the downside risk.
Humans Close Revenue-Critical Conversations Better
If the issue is really a pre-sale objection, product fit conversation, or retention save attempt, a strong human agent still has an edge. The difference is not just empathy. It is adaptive judgment. A person can hear hesitation, reframe value, adjust tone, or decide when silence is better than another message. That is not where I would chase maximum automation.
- Send to a human first when the conversation is high-risk, high-value, emotionally loaded, or policy-sensitive.
- Send to AI first when the issue is common, low-risk, reversible, and answerable from approved content.
- Use AI plus human handoff when the customer needs speed first and judgment second.
That middle category is where most teams live now. The mistake is forcing yourself to choose one side for every ticket.
A Practical Routing Framework for Sending the Right Queries to AI or Humans
The cleanest decision framework I know uses four filters: frequency, risk, emotion, 그리고 revenue impact. If a query is frequent, low-risk, low-emotion, and low-revenue-risk, AI should own it. As soon as risk, emotion, or revenue stakes rise, the case should move toward a human.

| Conversation type | Best owner | 왜 | Escalate when |
|---|---|---|---|
| Store hours, service areas, policy lookups, shipping basics | AI | High frequency and low risk | The customer asks for an exception or the answer is missing |
| Order status, appointment confirmation, subscription date checks | AI | Fast retrieval matters more than human tone | Backend data is unclear, delayed, or disputed |
| Quote requests, lead qualification, product-fit questions | AI first, human second | AI can gather context and keep response time near zero | Budget, urgency, or product complexity rises |
| Refund requests, billing disputes, cancellations, complaints | Human | Emotion and discretion matter more than speed | Immediately if sentiment is negative or repeat contact is detected |
| Security, fraud, regulated advice, medical or legal edge cases | Human | Risk is too high for generic automation | Immediately, with AI limited to intake only |
| Outage updates or incident messaging | AI first, human on edge cases | AI can broadcast the known status quickly | The customer needs compensation, exception handling, or case review |
If you want the short version, here it is: AI should own the front door, not the entire building. Let it classify intent, answer what is known, and collect what the human needs next. Then let the person take over when the conversation becomes expensive, risky, or emotionally charged.
This is also where a lot of teams confuse two separate questions. One question is who should answer first. The other is which channel should the customer use. Those are not the same. If you are still sorting out the channel side, this chatbot vs live chat comparison goes deeper on website chat, labor economics, and channel fit.
Per-Interaction Cost Math for Human-Only, AI-First, and Hybrid Support
Support leaders do not need more vague ROI language. They need per-interaction math they can defend in a budget meeting. Here is a simple model using public benchmark data and current public pricing.
시나리오: a team handles 1,200 inbound support conversations per month. We will use the lower human live-chat benchmark of $2.58 per interaction as the busy-queue floor, and the stricter benchmark of $4.54 per interaction as the more conservative planning number. For the bot model, we will use MessengerBot Pro at $49.99 per 30 days and add 4 hours per month of human review and tuning at the same loaded rate.
Loaded human hourly cost = median wage x overhead multiplier Human cost per chat = loaded hourly cost x handling time or shift economics AI cost per resolved conversation = platform cost + review labor Hybrid monthly cost = AI layer cost + human escalations cost
| Model | Monthly cost using $2.58 human benchmark | Monthly cost using $4.54 human benchmark | What the model assumes |
|---|---|---|---|
| Human-only support | $3,096.00 | $5,448.00 | All 1,200 conversations handled by people |
| AI layer only | $157.07 | $157.07 | $49.99 plan plus about 4 review hours at $26.77 per hour |
| Hybrid at 65% AI resolution | $1,240.67 | $2,063.87 | 780 conversations resolved by AI, 420 escalated to humans |
That hybrid model is the important one. At a 65% AI resolution rate, monthly cost falls by about 59.9% against the lower human benchmark and about 62.1% against the stricter benchmark. That is the kind of saving that gets attention because it does not require replacing the whole team. It only requires sending the wrong work away from the team.
The bot-side economics get even clearer when you isolate the AI-resolved conversations. In this model, the bot layer costs about $157.07 per month. If it fully resolves 780 conversations, that is about 대화당 0.20입니다.. Put that next to $2.58, $4.54, 또는 $8.06 for the human models and the budget argument becomes straightforward.
Now layer in enterprise-style outcome pricing. If you ran those same 780 AI resolutions through HubSpot at $0.50 each, the variable AI bill would be $390. Through Intercom Fin at $0.99 per successful outcome, it would be $772.20. Those numbers are higher than a fixed-fee SMB stack, but they still compare well against a human agent handling the same routine traffic.
The caution is just as important as the savings. Do not count a partial handoff as a full automation win. If AI collects the order number but the human still does all the work, you saved time, not a full interaction. That is still worth money, but it is not the same line item.
What Customer Satisfaction Data Really Says About Bots and Humans
This is the part where lazy articles pick a side. Real data is more nuanced.
LiveChat’s benchmark page shows average human-chat satisfaction at 64.2% and chatbot satisfaction at 64.7%. That does 하지 prove bots are universally better. It does prove something useful: on the right kind of question, customers do not automatically resent automation. Speed and clarity can matter more than whether a human typed the answer.
Now look at consumer preference research. Pega’s 2026 consumer study found that 66% of respondents prefer human-led support, 77% say they often or always achieve better outcomes with humans, and only 2% want to interact exclusively with generative AI chatbots. Gladly’s 2026 research makes the gap even sharper. It reported that 59% prefer AI as a first stop for support, but 57% expect a clear path to a human within five AI exchanges and 54% will walk away after 10 minutes of getting nowhere.
Put those findings next to Zendesk’s number that 86% of consumers say responsiveness and accurate resolution strongly influence whether they buy, and the pattern is hard to miss. Customers want AI for speed. They still want humans for confidence. What they hate is the trapped middle state where the bot is slow, vague, repetitive, or blocks escalation.
| Data point | What it actually means |
|---|---|
| LiveChat: chatbot CSAT slightly above human CSAT | Routine conversations can score well when the bot is fast and accurate |
| Pega: 66% prefer human-led support | People still want a person involved when the stakes rise |
| Gladly: 59% prefer AI as a first stop | Customers accept automation when it reduces waiting |
| Gladly: 57% want a human path within five exchanges | Escalation speed matters almost as much as first-response speed |
| Zendesk: 74% expect 24/7 service because AI exists | AI raised the baseline, even for teams that still rely on humans |
If you want the honest summary, here it is. Customers do not prefer chatbots or humans in the abstract. They prefer the right mode for the job. They like bots for simple, time-sensitive, repetitive work. They like humans for complex, emotional, or expensive conversations. The best service design accepts that instead of trying to prove one side morally superior.
Why the Strongest Support Teams Run a Hybrid Model Instead of Going All-In on AI
The hybrid model is not a compromise. It is the mature operating model.
Look at the public resolution claims from the companies shipping serious support AI. HubSpot says Customer Agent resolves about 65% of conversations across more than 8,000 activated customers. Intercom says Fin resolves an average of 67% of customer queries across more than 7,000 paying customers. Zendesk markets 80%+ automation potential for AI agents in the right conditions. Even in the most optimistic framing, none of those numbers say humans disappear. They say humans stop doing the wrong work.
The best hybrid support systems usually follow the same pattern:
- AI handles the first 30 seconds. It greets, identifies intent, and gives the customer a clear starting path instead of a blank text box.
- AI resolves the known lane. It answers from approved content, retrieves simple account details, and handles repetitive tasks fast.
- AI captures context before handoff. Order number, email, plan, device, screenshot, timeline, and issue type are collected once.
- Humans take the expensive lane. Complaints, exceptions, save attempts, high-value leads, and risky cases move to an agent.
- Humans inherit the full thread. The customer does not restart the story, which protects both CSAT and handle time.
That is the model top brands and mature support teams keep converging on because it aligns with both the cost math and the customer data. AI owns speed. Humans own outcomes that need judgment. The handoff is the product.
Another reason hybrid wins is that it protects you from hype-driven overreach. AI capability is rising fast, but support quality still depends on governance, content, routing, and escalation discipline. A hybrid model lets you expand safely. An AI-only model encourages you to chase deflection before you have earned it.
The Mistakes That Make Replacing Humans With AI Backfire
Most failed AI support rollouts are not caused by bad models. They are caused by bad operating decisions.
Replacing the Human Escape Hatch
If the customer cannot reach a person when the issue goes off-script, the bot starts feeling like a barricade. That is exactly what the Gladly data warns about. People will tolerate AI. They will not tolerate being trapped by it.
Measuring Deflection Instead of Resolution
A deflected conversation is not automatically a solved conversation. If the customer comes back two hours later, opens email after failing in chat, or calls because the bot stalled them out, your savings were imaginary. Track repeat contact and reopen rate, not just how many conversations the bot touched.
Training the Bot on Weak Content
If your FAQ is vague, outdated, or contradictory, the AI layer will reflect that. Most bad bot experiences are knowledge problems wearing an AI costume. Before you buy more automation, clean up the answers you are automating.
Believing the Vendor Best Case Is Your Day-One Reality
When a vendor says 65%, 67%, or 80% automation potential, that is not your forecast until your own data proves it. Treat those figures as planning ceilings, not guaranteed launch numbers. A realistic first target for most teams is not perfection. It is getting the obvious repetitive traffic off the human queue cleanly.
Forgetting That Cost Cutting Can Damage Perception
Klarna is the cautionary example everyone in this space noticed. On February 27, 2024, the company said its AI assistant was handling about two-thirds of customer service chats and doing the work of roughly 700 full-time agents. . May 8, 2025, Bloomberg reported CEO Sebastian Siemiatkowski was shifting back toward giving customers the option to speak with a real person, saying the company had gone too far on cost focus. The lesson is not that AI failed. The lesson is that efficiency and customer preference are not the same KPI.
My pre-launch checklist is boring on purpose, and that is why it works:
- Give customers an obvious human option before they need to beg for it.
- Use real historical questions, not imagined ones, to train the first version.
- Write hard escalation rules for refunds, complaints, repeat failures, and risk-sensitive topics.
- Test the handoff on mobile and after hours, not just during a perfect desktop demo.
- Review failed bot conversations every week for the first month.
- Expand automation one intent family at a time instead of trying to automate the whole desk at once.
The Metrics That Tell You When Your AI Can Safely Take More Traffic
The wrong expansion signal is conversation volume. The right signal is trustworthy resolution at acceptable satisfaction.
If your AI is answering more messages but causing more repeat contact, more transfer complaints, or more silent abandonment, it is not ready for more traffic. It is just busy. What you want is evidence that the bot can own a given intent category with stable quality.
| 지표 | 좋은 모습은 어떤 것인지 | 왜 중요한가 |
|---|---|---|
| Resolution rate by intent | Stable and rising on a specific query family | Shows where AI is genuinely solving, not just replying |
| Repeat-contact rate within 7 days | Flat or falling after automation expands | Catches fake deflection |
| Bot CSAT vs human baseline | Within a few points on routine intents | Protects customer experience while scaling AI share |
| Escalation speed | Fast handoff when sentiment or risk turns negative | Prevents AI from becoming a dead end |
| Human assist rate | Low on routine issues, intentionally high on sensitive ones | Keeps routing honest |
| No-answer or fallback rate | Falling over time as content improves | Shows where the knowledge base is still weak |
My practical rule for expansion is straightforward:
- Pick one intent family, such as order status or appointment changes.
- Let AI take first response and full resolution on that one family only.
- Review every failed conversation weekly until fallback patterns are clear.
- Expand only after repeat contact stays controlled and CSAT holds close to the human baseline.
- Move the next repetitive intent over, not the hardest one.
That is slower than the grand AI replacement story, but it is how real support operations avoid self-inflicted churn.
How to Start the Hybrid Model Without Building a Giant Support Program
If you want the fastest practical win, do not start by trying to automate every edge case. Start with the top 10 repetitive questions, one clean human handoff path, and one dashboard that shows resolution rate, repeat contact, and transfer reasons. That is enough to learn whether AI should take 20%, 40%, or 65% of your queue. If Messenger or web chat is part of that rollout, 메신저봇 가격 보기 and start with the smallest tier that gives you real routing, forms, and escalation control. Good support AI is not the bot with the biggest claim. It is the bot that knows when to stop and hand the conversation to the right person.
자주 묻는 질문
AI 챗봇이 인간 상담원보다 더 나은가요?
They are better for different jobs. AI chatbots are better at instant replies, repetitive FAQs, after-hours coverage, and low-cost triage. Human agents are still better at exceptions, complaints, emotional conversations, policy judgment, and high-value sales or retention work. The strongest setup is usually hybrid, not one or the other.
AI가 실제로 고객 서비스의 몇 퍼센트를 처리할 수 있나요?
For most teams, a realistic mature range is around 40% to 70% of routine support traffic, depending on content quality, channel mix, and how repetitive the queue really is. Public vendor benchmarks in 2026 cluster around the mid-60% range for strong deployments. That is a useful planning benchmark, not a launch guarantee.
고객은 AI 챗봇과 인간 중 어느 쪽을 선호하나요?
Customers usually prefer AI for speed on simple tasks and humans for complex or sensitive issues. The best reading of current data is that people accept bots as a first stop, but still want a fast, obvious path to a human when the issue becomes difficult or emotional.
인간을 AI 챗봇으로 대체하면 얼마나 절약할 수 있나요?
It depends on your true human cost per interaction and how much of the queue is genuinely repetitive. In the model used in this article, moving to a hybrid system with 65% AI resolution reduced monthly support cost by about 60% while keeping humans on the remaining 35% of traffic. The exact number changes by wage level, software stack, and handle time, but the labor savings can be substantial very quickly.
챗봇이 인간에게 에스컬레이션해야 하는 시점은 언제인가요?
A chatbot should escalate when the customer is upset, the answer is unclear, the issue involves a refund or billing dispute, the case is high-risk or regulated, the customer explicitly asks for a person, or the bot has already failed once. Escalation should happen early enough that the customer sees AI as useful triage, not a barrier.




