Reading 35, page 241, question 12: Based on Exhibit 2, the underperformance at the overall fund level is predominantly the result of poor security selection decision in…
The answer on page 243 shows the sum of security selection + interaction. My question is why is interaction effect added here, and should I expect the same assumption on real level 3 exam?
edit: i have submitted an erratum to the CFA institute, currently waiting for reply.