Index of economic activities Time b BUSINESS CYCLE K G E 4.4.1 Identify the trend line in the business cycle above. 4.4.3 Briefly describe the term business cycle. 4.4.2 Which letter represents a trough in the diagram above? 4.4.4 Explain economic activity during phase EF in the business cycle. (1) (1) (2) (2) 4.4.5 How can the length (BF) be used in forecasting of business cycles? (2 x 2) (4)​