BeautySomeone getting their hair cut or done every few months

When I go into a salon, I want to know the total beforehand, so I do not end up paying twice what I asked about.

Khi tôi vào một tiệm làm đẹp, tôi muốn biết trước tổng số tiền, để không rơi vào cảnh giá cuối gấp đôi giá đã hỏi.

Job context

The price list does not cover everything
High
The listed price is only a starting point.
Root cause: Price depends on length, thickness and condition, measurable only in person
Offered add-ons while already in the chair
High
Very hard to decline from that position.
Root cause: The offer arrives when the client is least able to refuse
No way to judge whether an add-on is needed
High
Whoever advises is also whoever sells.
Root cause: The adviser benefits directly from the advice
Asking the price mid-service feels awkward
Medium
As though you were doubting them.
Root cause: Social norms read a mid-service price question as distrust
Every salon prices differently
Medium
Two places cannot be compared.
Root cause: There is no shared naming for service components

A solution is not the same thing as a product, a customer can hire a behaviour or a workaround too.

Ask the price before sitting down
Behaviour
The only moment of equal footing, and the figure given is still an estimate.
Book through an app that lists prices
Product
Shows a price up front, with the variable parts still outside it.
State a budget at the start
Behaviour
The most effective move, and few are comfortable making it.
Return only where the price is known
Workaround
Predictable pricing, at the cost of every new option.
Prepay for a package
Product
Fixes the total, and ties you to that one place.

Whoever advises on which extra service is needed is also whoever earns from it, and the client has no second source.
Why existing solutions fail: Staff in many salons are paid on add-on sales, so honest advice and the adviser's own income sit on opposite sides, and the client has no way to know which they are hearing.
Potential opportunity: An assessment of hair or skin condition separated from selling the service, paid for on its own.
The price is asked before sitting down and the additions appear once seated, and precisely across that seam the client's ability to refuse nearly vanishes.
Why existing solutions fail: Nobody designed that moment deliberately, yet every salon benefits from it, so no force moves the offer earlier, to when the client is still standing and could still leave.
Potential opportunity: Putting every component and price on the table at the initial consultation, before the client sits.