as I noted in Part Three, US economists often underestimate the increase in top incomes because they rely on inadequate data (especially survey data that fails to capture the very highest incomes). As a result, they pay too much attention to wage gaps between workers with different skill levels (a crucial question for the long run but not very relevant to understanding why the 1 percent have pulled so far ahead—the dominant phenomenon from a macroeconomic point of view).53 The use of better data (in particular, tax data) may therefore ultimately focus attention on the right questions.
