His crops and livestock boost the economy
In historical times in the far East, crops and live stock were the main items of trade which economies rested on. GZA’s metaphor here is in that he is also talking about what he is growing, his stock, is ‘live’ (meaning ‘dope’, or ‘sick’) which he was able to gain money from by performing.
It’s also possible here that GZA is talking about how his great lyrical ability has always enabled him to economise in terms of how long his verses are. GZA has always been about making the rhyme strong and short, as opposed to rapping for long periods of time without saying much. One of his most famous verses from Wu-Tang Forever begins- ‘Too many rhymes, weak songs are mad long, make it brief son, half short and twice strong’
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