How to build an in-game economy in f2t?

Question

Marketing

The first experience of free 2 play game development is not easy, especially when it comes to the in-game economy.
The main question is: how to build prices for in-game purchases? How to correlate in-game currencies?
Are there any useful articles on this topic, calculation formulas, basic parameters that will help in this, etc. (my searches have not been successful yet - water, water, water is everywhere)

Answer 1

Watch presentations from GDC , read articles on Gamasutra .