Nowadays, Thailand has been classified as a upper middle income country.
Thailand's GDP per capita is $5,779 (as of 2013).
Meanwhile high income level threshold is $12,735.
If we give that high income level threshold is constant and
GDP per capita growth rate is constant at 3 percent per year (according to recent data),
GDP per capita growth rate is constant at 3 percent per year (according to recent data),
we can write the equation below ..