Problem: maximize profitability selling ice at a hippy poser wannabe festival. The constraints are:
1) Users must be at least minimally satisfied. No shouting, cursing, "line rage", or riots. The user must get a reasonable product with an acceptable wait time at an acceptable cost. The process should seem fair.
2) Costs must be minimized these include:
a) cost of labor, this is probably the biggest cost
b) materials cost, waste from melting ice must be minimized
c) transportation and storage costs. No constant shuttling to and from the supplier who may be 100 KM away. Some transportation costs may actually amount to labor costs,e.g. the cost of a driver.
3) regulatory compliance cost mostly health and sanitation.
4) Losses due to theft must be minimal. This sort of implies cash on hand must be minimal. Higher sales may require banks drops for security reasons.