I'd like to point out that the the idea rests on an inefficient market, where price/transaction information was kept secret long enough to turn the trust-violat

I'd like to point out that the the idea rests on an inefficient market, where price/transaction information was kept secret long enough to turn the trust-violation into worthwhile profit. In contrast, an efficient market with perfect price information means other cartel members would instantly notice and change their prices to punish the defector.