Economic Profit - when to use BV and when to use MV

CFA Level II
#1

In equity we show this formula taking WACC from book values.

In corp fin it does not state explicitly. Is it the same or market values?

#2

WACC should always be market values, shouldn’t it?

#3

In Residual Income EVA (which is basically economic profit) uses book values. I guess this is just specific to RI which assumes all its models on BVT-1 ?