We are a marketplace for independent cleaners.

Can they set their own prices then?

No. Our pricing table is simple. 45,000KRW(about $40) for 4 hours, 85000KRW(about $80) for 8 hours.

Then you're not a marketplace for independent cleaners.

Intriguing. As a thought experiment, if San Francisco organizes a farmers market for Tomato farmers and city residents but stipulates that prices must be fixed at $2 per tomato, is that no longer a market by the economic definition, now that price discovery has been taken away?

Depends on if you're buying from 'the farmers market' or if you're still shopping amongst individual--but price fixed--farmers.

It would be a fixed market, not a free market.