A macroeconomic commentary argues that the long-running GDP formula of population growth, productivity growth and debt growth has weakened as demographics slowed and productivity stalled, leaving debt to carry economic expansion. The commentary proposes an updated “economic singularity” model that adds AI and robots to the formula, framing productivity as intelligence produced per unit of energy. It compares the potential shift to the post-1950s period, when GDP growth reduced debt as a share of the economy.