Monetary System Model

Agent-Based Model Simple (ABMSIM) is an interpretation of G&L's first flow , non-government monetary system.

Policy variables are government expenditure (a stimulus quantity) and a government mandated taxation rate (a percentage). Change in both expenditure and taxation determine the quantity of money (net financial assets) that flow towards or away from the non-government sector. This is the government sector fiscal balance, either in surplus (a money flow away from the non-government sector), or more typically, in deficit (a money flow toward the non-government sector).

The model and therefore the economy is defined by key policy variables and the behaviour of agents. ABMSIM consumes real-world government expenditure time-series data in order to produce system cycles over time.

Missing Martians

We know whom to blame. Opportunity found them. Damn Martians. With their little green faces, big brains and lovely eyes. They see Earth. Laughing they were. Cloaked underground with their cold fusion tech.

Who will lead a crewed mission to Mars? Well, the , of course.

Question: How will they pay for it?


View a description of .

Before Times

The model consumes United States of America (USA) expenditure data from 1960 to 2019.

View the ABMSIM Run USA report.

Arrival & Beyond to 2050

The model consumes USA expenditure data from 1960 to 2019 (flat tax regime). The model then runs from 2020 to 2050, increasing government expenditure at 4 percent per annum (marginal tax regime).

View the ABMSIM Run Exploratory report.