Target rate in Neoclassical theory and interest rates in New Growth Theory?

How does the target rate play into the Neoclassical theory? How does low interests play into the New Growth Theory?

Neoclassical --> as long as real ROR > Target ROR saving will stimulate growth until the point where accumulated capital leads to diminishing returns, reducing real ROR. New Growth --> there is no target ROR, as long as tech advance, growth increase. when real ROR decrease, it an incentive for ppl to look for new profitable tech., and thus its a never ending cycle.

I did a question on the schweser bank saying that low interest rates were needed in the New Growth theory.

low IR is the incentive, so theoritically yes u do need it.