Malthus' prediction was pessimistic
he thought that whilst people grow at a geometric rate, resources grow at a arithmatic rate, which will eventually be the same and there will be more people than resources creating a resource deficeit
However this hasn't happened as yet due to Agricultural revolution, Industrial revolutions, international trade etc. emmigration, HYVs, Green revolution and GMS
He used postive checks such as war, famine, death to demonstrate how to keep a reduced population
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