  The GDP growth of national economies is modelled by the logistic function.
Applying it on the GDP data of the World Bank till the year 2020, we forecast
the outcome of the competitive GDP growth of Japan, Germany, UK and India, all
of whose current GDPs are very close to one another. Fulfilling one of the
predictions, in 2022 the GDP of India has indeed overtaken the GDP of UK. Our
overall forecast is that by 2047, the GDP of India will be greater than that of
the other three countries. We argue that when trade saturates, large and
populous countries (like India) have the benefit of high domestic consumption
to propel their GDP growth.
