It is sometimes argued that strong export growth in developing countri
es occurs mainly in the presence of large unemployment of domestic res
ources, with price reforms playing a relatively minor role. We investi
gate the relative contribution to export growth of improved profitabil
ity and reduced capacity utilization rate. The conditions under which
domestic demand and capacity utilization may affect export supply are
derived from a choice-theoretical model of the firm. Our empirical ana
lysis focus on the cases of Morocco and Turkey. Our results indicate t
hat both prices and capacity are significant determinants of export su
pply. Counterfactual simulations suggest that for Turkey lower capacit
y utilization played a crucial role in fostering export growth in the
1976-1980 period, whereas improved export profitability takes most of
the merits of export expansion afterwards. For Morocco, the contributi
on of relative prices to export growth appears to be modest.