The hard part of fully realizing potential growth is shifting the composition of domestic demand from consumption to investment without adding leverage. That means paying for it on the public-sector side, via taxes and a reduction in household consumption (and in wealth accumulation).
但主要问题在于公共部门投资仍远远低于维持增长的水平。充分实现潜在增长的难点在于让内需的组成从消费转向投资而不增加杠杆。这意味着靠公共部门来偿付，通过征税和减少家庭消费（以及财富积累）实现。