摘要：As food-industry supply chains mature, the players
change and power can shift from one vertical sector
to another over time. As early as 1956, Galbraith
noted that an increase (or perceived increase) in
market power by one sector might act as an inducement
for structural change among those firms
either selling to or buying from that sector. Such
adjustments have been observed in agriculture as
more firms formalize food-supply-chain relationships
(Cook 1999).
