Using Economic Models to Understand Problems

The question is whether the underlying process that generates what we see is a stationary or ogodic process or not. What are some causes that generate non stationarityits human beings, really, or rather, biological evolution? Mervin and i wrote this book er with a commitment, actually, to using economic models. For the purpose of use economic models is to help you understand problems better. It's not to predict what is going to happen. And wo can learn some interesting things by trying to do that.