Most Helpful Guys
I think the answer would depend on the amount of income a country can afford to spend, the needs of the other countries, and the goals of the giving country which are served by giving the aid. Foreign aid is sometimes given for purely humanitarian reasons and sometimes it is given to maintain an alliance with a country or to prevent the other country from becoming dependent on an enemy of our country.
I had to research a bit to find out how much my country is actually spending for this (to get a feeling for it). In 2017, Switzerland spent 0.46% of its GDP for various developmental aids. This is the 8th highest in the world. I think that's a pretty reasonable number and I probably wouldn't change it much. Perhaps I would raise it to 0.5% but not beyond that. Anywhere between 0.4% and 0.5% of a country's GDP seems okay to me.
Most Helpful Girl
Thanks to Obama, Who was always Arming the Terrorists in the Middle of the Night as we slept, He gave Out a lot of Money, honey.
Now that President Trump, No Chump is in Office , New Sherriff and Rules in Town. xx