Adaptive Economic Operating System

Monetary and credit policy

Monetary policy (r_policy, quantitative easing/tightening, liquidity provision) and macroprudential policy (loan-to-value and debt-to-income limits, capital requirements, countercyclical buffers) sit alongside fiscal policy as separate but interacting controllers acting on the same coupled system.

Two features of this system are worth stating explicitly rather than assuming away:

• Credit creation is endogenous. New bank lending simultaneously creates new deposit money, subject to capital, liquidity, risk and regulatory constraints — it is not intermediation of a fixed pre-existing pool of savings. Where that credit goes changes its effect: financing productive investment tends to raise productive capacity, while financing purchases of a fixed stock of existing assets (most visibly housing) can raise asset prices and collateral values, potentially loosening further borrowing capacity in a reinforcing loop.
• Interest-rate changes redistribute cash flow, they do not act uniformly. A rate rise increases debt-service burden for floating-rate borrowers, increases income for savers, raises financing costs for leveraged firms, and reduces borrowing capacity for asset buyers — the aggregate effect depends on the distribution of assets and liabilities across the population, not just the size of the move.

Because fiscal, monetary and macroprudential policy act on the same system, one controller can partially counteract another (fiscal expansion meeting monetary tightening, for instance). Coordination between controllers is treated as a genuine open design problem here (see Stability and Robustness), not assumed to resolve itself.