This can be tricky.
Businesses exist to make money. "Trade" implies goods and services exchanged for capital. Capitalism, viewed from space, purports to be a system - partially described as money flowing from consumers to producers; and the producers then becoming consumers of other producer's goods/services; and on the cycle goes.
In a perfect world, all parties benefit from all trade - but the world isn't perfect. There is imbalance in every transaction.
I believe unethical behavior occurs when intentional deception enters the picture. And the usual motives apply: greed mostly, followed by power and influence.
However, not all imbalance is the result of unethical behavior. Hence the trickiness...
Just my $0.02,
:{> Andy
Andy Leonard, Chief Data Engineer, Enterprise Data & Analytics