Since this does not have an economic validity, since it denies the problems of opportunity cost, "Say's law", among other things, why do Keynesians try so hard to calculate it and end up obtaining some result? Why are you obsessed with finding an example that results in 1 or more?

Regarding the last question: if you could find the above example, would that be the point to leverage yourself and say that it is better to increase spending than to lower taxes?.

Atte. Austrian.