Subsidy and protectionism are economic weapon.
It takes time to build up an infrastructure for an industry, killing your competitors with subsidy then raise the price up after all your competitors are gone. Robber baron and standard oil have done it in the past, it is now being done on country level.
Do you know of any modern of current examples of a country or a corporation doing this?
Solar companies in China seem to be doing this. And since Chinese YUAN is being subsidized by average China citizen, one can also argue all the producers/exporters in China are doing it to kill their competitors abroad.
It isn't just Solar companies in China but much of China's exports are subsidized by the chinese government and allowed to be sold at below cost. Another good example is the chinese textile industry