Javed Younas & Subhayu Bandyopadhyay (Federal Reserve Bank of St. Louis) have posted Do Donors Care about Declining Trade Revenues from Liberalization? An Analysis of Aid Allocation on SSRN.  Here is the abstract:

Many developing country governments rely heavily on trade tax revenue. Therefore, trade liberalization can be a potential source of significant fiscal instability, and may affect government spending on development activities. Donor nations may take this into account in making their aid allocation decisions for developing nations. Our findings suggest that bilateral donors provide substantially larger amounts of aid to compensate (or reward) liberalizing recipient nations who also face declining trade tax revenues. Interestingly, these effects are statistically insignificant in the context of multilateral aid. Multilateral donors are more focused on income per capita and may be using it as a de facto measure of average living standards in the recipient nations.