You're no idiot, of course. You know expansion is good and recession is bad. But what forces lead to one or the other? It's not always easy to grip on the various influencing factors, let alone the many theories on how they work.Don't lapse into depressio
![Cambridge IGCSE Physics – Duncan, Tom [SRG]](https://cdn.pdfdrive.com/assets/thumbs/9bc/9bc913c169f0db09630a0efc47712189-s.jpg "Cambridge IGCSE Physics – Duncan, Tom [SRG]")
