[TheRealThing]

"But don't touch the oil and the wine." Scarcity, famine, ...common people starve...the wealthy? "Oil and wine." Surely you have seen this? It's fairly standard commentary on 6:6.

You said economic injustice, not even remotely the same thing.

The rich will fare better for a little while, more so than everybody else. That happens in every war and has nada to do with the balances you mentioned and the fact that the black horse means simply that famine is coming. Another portion of 'standard commentary' mentions the fall of Babylon, or the financial system of the whole world, which will crash in the space of one hour.
Revelation 18:10-11 (KJV)
10 Alas, alas, that great city Babylon, that mighty city! for in one hour is thy judgment come.
11 And the merchants of the earth shall weep and mourn over her; for no man buyeth their merchandise any more: