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Overview of the Interactive Demographics Model

The diagram below shows the overall structure of the model

  • As detailed below the user can change each of 9 variables - the ones where the box is highlighted with a red border.

  • These are all determinant variable which can be influenced in the short term by government or society attitudes.

  • The nature of the other variables is very much a function of the state of the determinant variable (For example, the size of the labour force is a function of the working age population and propensity to work - the latter being a determinant variable).

  • Having changed the variable and pressed ‘run scenario’ all variables affected are changed and highlighted in yellow - so you can quickly see the breath of the impact of that change.

  • You can also see the detail pattern of a variable for the years 2007 to 2043 by pressing the ‘change’ or ‘detail’ button by each variable.

This figure shows the total schema - but don’t be put off - it is easy to read and use.

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It really divides into 5 areas plus navigation/selection area. You can zoom in on each area by a click of a button.

To operate the Model there are the following steps:

Step One:

Load the data for a selected country and specify the years to be displayed in the above grid. (You can see the values of a variable for all years from 2007 to 2043 by clicking on the button in the box for that variable).


Step Two:

Alter the value of one or more of the nine determinant variables (highlighted by a red boarder). These are

  1. Birth rate per 1000 women aged 15 to 49 years.

  2. Migration rate as a percent of the total population in the previous year.

  3. Participation rate of males aged between 15 and 74 years in the workforce.

  4. Participation rate of females aged between 15 and 74 years in the workforce.

  5. Fixed Capital Investment per annum.

  6. Education Profile of the adult population.

  7. Wages as a percent of GDP per capita.

  8. Productivity trend.

  9. Propensity of households to spend (% of gross income).

The value of the other variables are a function of what happens to the above variables. For example the number of women of working age for the next 15 years is already determined by the age profile of females alive today. Neither a government nor you can change that age profile in the short term - but by changing birth rates it affects it in 15 years time.


Step 3:

Press the button ‘Run Scenario.

The model will recalculate the expected future values of all variables as a result of these changes. It highlights all changed cells in bright yellow for easy identification of the impact of the change(s).

The model is designed to re-solve from the base case every time - so you can change just one variable first - see the impact of that, then keep that change and also change one other variable and see the combined impact of the two changes etc.

You can start with a fresh solution by pressing the ‘Reset button’


Step 4:

Interpret the results as described here.

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