That's a partly inane quote.
The first part('in times of prosperity') is inconsequential because the second part is true without it. 'the fattest pig goes to the butchers first' is sufficient to make the point and it's the equivalent of 'the lawn mower cuts the tallest grass first'.
ah split opionions then lol
The fat cats at the the top will be first against the wall when the revolution happens.
The issue I have with this interpretation is that I don't believe it's true. As we've seen over the last few years, the most greedy people don't end up going to the butchers first, it's the thinnest pigs that do.
My understanding is that it means fat farmyard animals will often prefer to purchase their meat for a local butcher, rather than a supermarket. In addition their desire for meat is such that they will often arrive at the butchers just before opening in order to avoid the queues.