According to Bloomberg, that tracks fortunes of over 2,800 billionaires, Bill Gates has crossed the $100 billion threshold in wealth to join Amazon Inc's Jeff Bezos as a centi-billionaire. The Bloomberg Billionaires Index shows that the world now not only has two centi-billionaires but 145 deca-billionaires (ones that are worth at least $10 billion).

The Microsoft co-founder who was once the world's richest person has not seen such a growth in his wealth since the dot com boom. Bezosovertook Gates as the world's richest person and also the first one to enter the $100 billion club.

The Amazon founder added $20.7 billion in wealth this year alone and is now worth $145.6 billion. Meanwhile, Gates gained $9.5 billion in 2019.

Their increasing wealth is pointing out to a widening wealth gap seen across countries including India. For example, the net worth of Spanish businessman Amancio Ortega is equal to 5 percent of his country's gross domestic product.

As for Gates and Bezos, they may not stay in the $100-billion-club for long. While Gates has already donated over $35 billion to the Bill & Melinda Gates Foundation, he has said that he intends to donate at least half of his wealth. On the other hand, Bezos is likely to lose his wealth when his divorce finalizes.