If there was evidence that citizens of rich countries were stashing cash in banks in low income countries, requiring immediate reciprocity would make a lot of sense. But the reality is that very few citizens of rich nations are sending their money to banks in low income countries, yet vast sums are flowing the other way. When you take a closer look at who controls the bulk of the offshore financial market, trying to come up with an answer as to why rich countries would oppose a temporary period of non-reciprocity for developing countries gets that much harder.

There simply isn't much offshore money stashed in developing countries in the first place.