"Markets" only work when there is a seller, and neither helium nor tuna have a seller. The price of Tuna is set of "how expensive is it to produce a can of tun

"Markets" only work when there is a seller, and neither helium nor tuna have a seller. The price of Tuna is set of "how expensive is it to produce a can of tuna" rather than "how many tuna are left in the ocean". In fact, the lower the production cost of tuna fishing, the higher the risk that we empty the ocean of all the tuna. It's really a problem of the Tragedy of the commons. There is no cost of tuna in the ocean, except the cost of fishing it. So it's a commons, and it will be overexploited. http://en.wikipedia.org/wiki/Tragedy_of_the_commons http://en.wikipedia.org/wiki/Tragedy_of_the_commons also: be sure to understand http://en.wikipedia.org/wiki/Collapse_of_the_Atlantic_northwest_cod_fishery http://en.wikipedia.org/wiki/Collapse_of_the_Atlantic_northw...