The usual statist objections to pure market action are total myths, not to mention weak and tangential objections. I'd love to argue the market with a hardline Marxist because at least they take a true thrust at market action rather than just nibbling.
>free rider, externalities
How is it a problem to anyone that a persons actions benefit others without deriving some monetary value for the benefit? No one is coerced, no rights violated. This is the only standard for judging these matters. No person should be forced to pay for a benefit for a transaction they did not agree to. Collective defense, for example, does not suffer because some people don't pay to play --- forcing equal patronage only serves to undermine the entire relationship between buyer and seller. More: http://mises.org/daily/2769
>collective action
Kickstarter.
>Information assymetries
Information is a value that is open on the market, as all values are. Not sure if the product your buying is safe? Buy insurance for it. Or, take the time to do your research and make comparisons. That time spent has a value. Decide which you are willing to give up: that time, or the cost of the insurance. Value is a dynamic and multifaceted concept. http://mises.org/daily/1135