[ch4s3]

It's an analogy. There's also an opportunity cost to a vote, insofar as casting a vote for A means you can not cast a vote for B. You also have a fixed amount of votes, 1.

> If you are poor you are not in a position where you have a choice, you have to buy the cheapest items that you need to survive

This is a really dull and tedious way of looking at things. Poor people make choices based on preference all of the time. Especially because food in the US is dirt cheap in historical terms. Sure you aren't buying organic grass fed meat, but you can pick from a wide range of cheap foods. Are your choices more limited, sure, but you still have choices.