The solution is hyperinflation. Why? Because of human biology. Humankind strives for a stable population size. In the old times when infant mortality was high, we had 6-7 children. Now when the infant mortality is low, we have just 1 or 2 (by average). The current situation is unsustainable. The weight of the elderly increase as the size of the child birth decreases, which is a self feeding loop as long as the buying power of the elderly is maintained. Hyperinflation removes the buying power of the elderly and gives it freely to the young, when their salaries increase. The increased buying power of the young make men more attractive to women because women consider money as something attractive, or what you can buy with it. This makes woman feel like having children and a new baby boom comes. As long as we don't have "happy" times where the buying power of the elderly is constrained, there will be no new baby boom.