Business cycles are a. alternating periods of smoothly expanding and contracting economic activity, which are usually illustrated using movements in nominal gdp. b. alternating periods in which real gdp increases in an expansion to a business cycle trough and then decreases in a recession to a business cycle peak. c. all roughly the same in duration and severity. d. alternating periods of expanding and contracting economic activity, which are usually illustrated using movements in real gdp.

World systems manufactures an optical switch that it uses in its final product. world systems incurred the following manufacturing costs when it produced 74 comma 000 units last​ year: ​(click the icon to view the manufacturing​ costs.) another company has offered to sell world systems the switch for $ 13.50 per unit. the world systems prepared an outsourcing decision analysis to show the cost per unit of making the switches versus the cost per unit of buying​ (outsourcing) the switches. ​(click the icon to view the outsourcing decision​ analysis.) world systems needs 86 comma 000 optical switches next year​ (assume same relevant​ range). by outsourcing​ them, world systems can use its idle facilities to manufacture another product that will contribute $ 140 comma 000 to operating​ income, but none of the fixed costs will be avoidable. should world systems make or buy the​ switches? show your analysis.