Economical systems = Effect on business decision. Know how  to spend, how to plan and taking risks looking at the economical environment. You and manager should understand the following concepts: 

7.1 Business Cycles
7.2 Economical Growth
7.3 Unemployment
7.4 Inflation
7.5 Exchange rate
7.6 The meaning of Money
7.7 Monetary policy and interest rate influences
7.8 The Good, Bad and Ugly of the economy.