Angel: Within the context of your question, can you qualify how you define "economic diplomacy".

We're you envisioning the impact of banking and monetary control policy on economic development?  There is an argument to be made that international banking conventions that have been put in place under the auspicious of anti-money laundering and countering terrorist financing, as well as financial policies for nations that have international impact (such as the US Foreign Account Tax Compliance Act) and as such, the control of money flow impacts upon foreign investment, foreign banking and the international movement of funds, thereby impacting upon economic and political development.

Or we're you envisioning trade and economic development strategies as an element of foreign policy?  Further, we're you envisioning the economic development policies of the World Bank, Asia Development Bank, New Development Bank or International Monetary Fund as elements of economic diplomacy or were you restricting it to nation states?

sir James, I was envisioning Economic Diplomacy as a foreign policy instrument structured on external trade, foreign investment and debt management.; with the aim of achieving political and economic development.

Foreign Policy could be regarded as the internationalization of a domestic resolve, in this case the national interest of the state concerned should be the focal point of any foreign policy. with this view the economic diplomacy on external trade should be structured in a way that it will benefit the interest of the home country in any trade and investment cooperation in the international community.