This is a common fallacy. Let's not make our Hindu friends excited over this.
The gap between India and China is 15 years IF India can grow as fast as China has grown in the past 15 years.
China has averaged over 11% growth in the past 15 years.
But can India grow at 11% a year for 15 years? India has grown only around 7% a year in the past two decades.
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Let's do some simple math:
China's GDP is around 11.4 Trillion US dollars, which is 5.2 times larger than India's GDP.
Let's very generously assume India can grow at 10% a year, it will take 17 years for India to catch to where China is today.
But as I said, India has only managed 7% annual growth in the past 20 years.
If India grows at 7%, which is her actual long-term performance, it will take India 25 years to reach where China is today.
Of course, China is still growing. At China's current growth rate the trajectory, Chinese GDP increases by 900 billion US dollars every year, equivalent to 40% of India's GDP.
The gap between India and China is actually INCREASING every year.
In other words, India is not catching up with China. India is actually falling further behind.
So please, Hindutvas, stop dreaming. India should try to catch up with Brazil, which is a more realistic goal.