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I have been visiting the DR since 1978, and since then, the highways have improved, people appear to be better fed and less often barefooted. Guaguas have replaced pickup trucks in the hinterlands. I suppose there is a degree of corruption and favoritism, and this seems to be a part of every Latin American country I have visited. But things still get built, some of the money makes its way to the expected source.
It is not like some countries in Africa. There was one situation in Nigeria where money was loaned to build some project, and
thousands of bags of cement were left on a pier, along with some expensive machinery. The government had spent all the money that was intended to transport this stuff to the building site, so it just sat there, where the machinery rusted away, and the cement turned into bags of stone. And the pier was rendered useless because of all the stuff left there.
So even if not all the money goes to the intended purpose, probably most of it does. Agriculture is an area where productivity has increased many times what it used to be because of new techniques and new strains of plants.