'growth' rate is likely to be a geometric constant, not an arithmetic one. A 0% growth rate followed by a 6% growth rate is not 3% geometric growth on average. 100% growth followed by -100% growth isn't 0% growth on average.
Many a quant manager has gotten rich off of spruiking the reverse of this story.
The market price of capital is the discounted value of future production (which will be equal to consumption). If the discount rate declines, then the price of capital goes up and at least some of this effect finds its way into measures of capital growth (and capital return).
Windfalls accrue to the current generation of risk capital holders and, to some extent, the current generation of consumers. Losers are everyone else - current savers and future generations.