The speaker thinks complementarity between inputs such as labor and capital, remote and in-person work, or skilled and unskilled work is much harder to analyze.

“like i think um it's much harder if you're talking about something like uh complementarity between uh labor and capital or complementary between like remote work and in-person work or like skilled or unskilled work and like there there are inputs pairs for which i would expect it to be much more difficult or like for example you're looking at the complementarity between like the quality of leadership of an army and its number of soldiers right i mean”