The worlds population is expected to touch 9.2 billion by 2050. As worforce in Europe and Japan shrink by 1% per year, the would-be retirees will have to continue on the job and these regions will have to encourage immigrants to keep the economy in place.

World Population (billions)
Year Population Average annual growth rate
1950 2.56 1.47
1960 3.04 1.33
1970 3.71 2.07
1980 4.45 1.69
1990 5.28 1.57
2000 6.08 1.21
2010 6.82 1.09
2020 7.54 0.90
2030 8.18 0.71
2040 8.72 0.58
2050 9.15 0.47
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