This paper examines the effects of credit availability in very early stages of economic development. Not only the poor but also the rich are assumed to be initially caught in a poverty trap. If the initial wealth level of the rich is higher than a threshold that is lower than the poverty trap, a credit market helps the rich escape from the trap. An improvement in credit availability decreases the threshold. The proportion of the rich also affects the threshold. Furthermore, if the degree of credit availability exceeds a certain level, the poor also can escape from the poverty trap.