The private banking system can only multiply off of the monetary base up to a certain multiplier, it cannot expand that base. Only the government treasury can e

The private banking system can only multiply off of the monetary base up to a certain multiplier, it cannot expand that base. Only the government treasury can expand that monetary base. If the private banks have conjured up 100x the monetary base in 1970, then when the population doubles by 2020, the banks cannot multiply further up to 200x. The treasury has to expand the base while the banks keep their multiplier fairly constant.