Surely if you do advertise a price that goes to what the fair price is. If I advertise it's $5000 and decide I don't like your business so I'm going to charge y

Surely if you do advertise a price that goes to what the fair price is. If I advertise it's $5000 and decide I don't like your business so I'm going to charge you $50,000 that's not fair or nondiscriminatory.