He ordered barley because barley is used in producing beer and whisky and he wanted to drink alcohol because he liked it. He therefore changed one of the commandments from no animals shall drink to no animals shall drink to excess because it suits his needs. It's just one of the many commandments that he changed.
If I wanted to get a better salary, my boss and I would have to bargain to figure out what is fair. A big example with this is in factories with working conditions. For example, wanting a certain amount of break time, or having drinks included with their work, etc. I don't know what they examples are, but this definition should help you out. If it doesn't, just comment what the examples are and I'll help figure out which one it is.
