This paper presents a simple model to investigate the effectiveness of foreign aid. It shows that foreign aid is most effective if it is given to a market economy with relatively high transaction efficiency. If transaction efficiency in a market economy is low due to, for instance, bad...

This is a note about Cheng et al.'s paper, in which we consider a dual structure of division of labour and trade that is missed in the model of Cheng et al. Though the inclusion of the dual structure will not change the main results in the paper by Cheng et al., it explores an interesting way...