You accept uncritically the view of one professor who has dismissed the 1990 census undercount as inconsequential.

ECONOMIST: Letters

In 2000 the census takers reported an undercount of 1.81%.

ECONOMIST: China's ten-yearly census: The world's biggest headcount | The

The 1.6% undercount of the population in the 1990 census, which you and he cite, is a net figure which includes an actual undercount of 3.4% and a double count or otherwise incorrect count of another 1.8%.

ECONOMIST: Letters