Stacking Functions

I love the concept of stacking functions. It's a permiculture concept. And basically try to figure out how many things you can do with one with one decision, so multi purpose would be better than single purpose. For example, could you join the merce ben's owners club, or figure out a way to get into that club that would allow you to get a discount on the car? I don't know if these things are applicable. But think a how you can combine these ideas. Finally, look for a way to stack all these ideas and stack these functions together.