Named after Polish-born English economist TADEUSZ RYBCZYNSKI (1923-1998), Rybczynski theorem posits that when one of two factors of production is increased there is a relative increase in the production of the good using more of that factor.
This unfortunately leads to a corresponding decline in that good's relative price.
Also see: Heckscher-Ohlin trade theory
T Rybczynski, 'Factor Endowments and Relative Commodity Prices', Econometrica NS, vol. XXII (1955), 336-41