The traditional units (
市尺,
市斤,
市升) were fixed in 1929 as simple ratios of metric ones: a
市尺 is a third of a metre and a
市斤 500 grams. Since 1959 a
斤 has 10
两 instead of 16. Metric units became the legal standard in 1984, but markets still price food by the
斤.