Since the collapse of the US financial system became undeniable, I’ve been struck by the number of people insisting that this has no implications for free-market policies because the US (and particularly its financial sector) is not truly a free-market economy. 
In the spirit of market economics, I want to offer a trade to all such people. I will agree that
(a) the US is not a free-market economy, and its failures do not constitute evidence against the claim that a pure free-market economy is the best possible form of social organization
(b) no other actually existing society is, or has ever been, a free-market economy, and no actual or conceivable events anywhere constitute evidence against the claim that a pure free-market economy is the best possible form of social organization
(c) In discussion with parties to the agreement, I will not contest the claim that a pure free-market economy is the best possible form of social organization
All I ask in return is that the counterparties to the deal agree not to advocate, oppose, criticise, or comment on any policy or political position that might actually be implemented, to ensure that the purity of the free-market ideal is not compromised by actual experience.
fn1. Since I haven’t checked, I’ll assume that this set of people has zero overlap with those I once debated who insisted that the supposedly superior performance of the US economy over social-democratic competitors demonstrated the superiority of free market economics.
fn2. I’m willing to make the same offer to Marxist-Leninists and (two for the price of one) to combine both offers for free-market Marxist-Leninists