How do I handle supply and demand?

I have three grocers, all in biking range.  They have about twenty bikers, just like me in one partition of their schiolgirls. They measure my flow, rate and basket size.  We, all twenty of us, make slight alterations in our schedule and basket size to equalize transaction  costs.  Once we 'get it', we quantize; fix the recipes that we use to fill our baskets.  When cash balances get a bit screwy, one way or the other, we get off my butts and change things around.  But getting off our butts is quantization cost.

I do it on a bike, a Bianchi Simplice.