Right, and there are other responses in those situations, as described above.
But even if you retreat to the position that dumping is really only feasible for goods that can't be stockpiled, then you already agree with me in enough cases for this to be moot.
Almost all public concern about dumping is directed at things like tires or concrete or steel that could be easily stockpiled if it were really a dumping strategy, if prices were returning to monopolistic high levels after reduced competition.
What's usually happening is that the other region simply has lower costs of production or is selling off overproduction at their own loss.
To me it seems that you are using some game theory ideas to explain how markets behave. The problem is that you forget to incorporate concepts from the "reality" you speak of in the last reply - more precisely timespace.
If you incorporate timespace, the enounciation becomes "the probability of the market punishing dumpers increases with time and becomes certainty after an infinit milenia have passed"
You say that reality tends to punish irrational practices which means that some escape this punishment. Hence I will conclude that with time irrational business practices accumulate in the free market.
Which will be at a loss, so you need just as much money. This is especially hard in developing countries. The market will still be destroyed, and you'll end up with a oligopoly.
> Or, stockpile the goods you sell,
Many things can't be stockpiled, and stockpiling also costs money (see the above)
One example where private dumping is tried, is uber with the taxi business. Uber regularly subsidizes fares (e.g. [1]). Local independent taxi drivers don't have the economic backing of investors and can't fight against dumping.
[1]: http://economictimes.indiatimes.com/news/international/busin...