Question

What is a market activity?

Answer 1

A market activity is an activity that does not transform inputs, but simply transfers the intermediate exchange from one transforming activity to another transforming activities that consumes this intermediate exchange as an input, e.g. from glycerine at the supplier to glycerine at the consumer.

Answer 2

The best way to learn is to try and teach. Divide the class in groups of three or four. Have each group of the class try to create lessons, teaching something new to one of the other group.
Hope it help you.