How many main ideas should be developed in a paragraph?

Explanation:

Ideally, just one. It you put too much in a paragraph and try and develop more than 1 idea at a time, sooner or later you will get into a mess trying to keep track of how to order the second third fourth ... idea without them interfering with each other.

My answer is for the body of an essay. The first and last paragraphs can be a little more flexible, but those two ought to resemble a list rather than a paragraph in the body of an essay.

is it multiple