To observe the timing of the effect of tea on educational attainment, I examine the effect of planting tea by birth year. I estimate equation (3) with years of education as the dependent variable to examine the effect of planting tea by birth year. The dummy variable for the 1962 cohort and all its interactions are dropped. I plot the three-year moving averages for the estimated coefficients for each cohort l in vectors βl and δl in Figure VI. This shows that female educational attainment was similar between tea and orchard areas until 1976, after which it increased in the former and decreased in the latter.