上元58 ocial Coalition Theory mfrade SHANGHAI JIAO TONG UNIVERSITY Three Factors:Land,Labor,and Capital Land-Labor Ratio No country can be rich both in land and in labor: 国 a high land-labor ratio implies abundance of land and scarcity of labor;a low ratio signifies the opposite. 1日1, Social Coalition Theory in Trade Three Factors: Land, Labor, and Capital Land-Labor Ratio No country can be rich both in land and in labor: a high land-labor ratio implies abundance of land and scarcity of labor; a low ratio signifies the opposite