The production of data. and the functioning of the market for observat
ions. are universal concerns to all fields of positive economics. Econ
omists. however. have typically placed greater emphasis on systematica
lly analyzing the consumption of data than on considering its producti
on. In the production of data through surveys. an important input mark
et is that of labour. in which a demander trades observations with the
supplying sample members. This paper analyses optimal monopsony compe
nsation in such data markets, the important relationship it bears to e
stimation using the data that are obtained, and the statistical effect
s of implicit public wage regulations that are present in U.S. markets
for observations.