I learned this from Gennie shop til trick

It's actually against the rules to ask someone to buy from your shop, as it is considered "begging".

There is an alternative though.
If you put a junk item into your shop for 1 MP, Scrooge will take it and you'll be able to empty your shop til about 1 minute after you've priced the item for sale.
I use pies from Pie Throw personally.

Very helpful on quests!!!!