Disparity in tax payments is a form wealth transfer, though I will agree it's not physical. The fact that it is not a physical transfer of funds is a sleight of hand.
1. a sum of money granted by the government or a public body to assist an industry or business so that the price of a commodity or service may remain low or competitive.
https://www.google.com/search?q=subsidy&ie=utf-8&oe=utf-8
sub·si·dy -- noun: subsidy; plural noun: subsidies
1. a sum of money granted by the government or a public body to assist an industry or business so that the price of a commodity or service may remain low or competitive.
--and--
https://www.google.com/search?q=subsidy&ie=utf-8&oe=utf-8#q=...
sub·si·dy --
late Middle English: from Anglo-Norman French subsidie, from Latin subsidium ‘assistance.’