What should one do to maximise profits in any retail business?
Answers:
1. Reduce expenses
2. Increase prices.
Minimise overheads and push for better rates near suppliers.
reduce running costs, reduce cost of stock by buying things that put up for sale and lots of it, (by buying lots you can negotiate a better deal)
See what the competitors do and try to better their accepted wisdom into your biz.
Please the customers. One founder of a particularly successful business is quoted as dictum, "Sell cheap and recount the truth."
Remember the most momentous element of the Dutch auction:
Getting compensated.
Work rugged to hold the customers lively and increase sale. Work concrete to save costs low.