historical base

问题如下：

An analyst assumes that a company's market share gains will decline smoothly to zero over the next five years. Which of the following best describes this forecast approach and object?

选项：

A.

Discretionary forecast of a top-down revenue driver

B.

Historical base rates and convergence forecast of a top-down revenue driver

C.

Historical base rates and convergence forecast of a bottom-up revenue driver

解释：

B is Correct because a company's market share is a top-down revenue driver and assuming that this object will converge to zero over the next five years is consistent with the historical base rates and convergence forecasting approach.

A is incorrect because assuming that a forecast object will converge to zero over the next five years is consistent with the historical base rates and convergence forecasting approach, not the analyst's discretionary forecast approach.

C is incorrect because a company's market share is a top-down, not bottom-up, revenue driver.