It all depends:
1) on the size of your store. More space, higher rent. you need to sell more to cover rent. Also if the store looks bare then people will come once, look around, and might never come again.
2) What’s your business model? Is it low margin’s high turn-around?
3) How quickly can you replenish stock?
There are a few books arouind. One of the very best is available at
I can recomend it. It certainly changed the way I look at the boutique business. Especially promotion and competition.