Bitcoin (BTC) has a market cap of $131 billion as of this writing. While this may pale in comparison to the value of global equities, which is $85 trillion, or the total global debt which is $255 trillion, it is still a greater amount of money than the physical cash in most of the countries on the planet.
The World Factbook tracks the M1 money supply of 194 different countries, with M1 being coins and physical cash plus demand deposits. Bitcoin’s (BTC) market cap is greater than the M1 money supply of 160 different countries, and would be ranked #34 if Bitcoin (BTC) was a country, in between the United Arab Emirates and Turkey.
Some countries which have a lower M1 money supply than Bitcoin’s (BTC) market cap include South Africa, Brazil, the United Kingdom, Israel, Greece, and New Zealand.
That being said, most of the money in the world is not physical cash or coins, and is actually digital deposits and bonds. The M1 money supply plus this additional money is called M2, also known as broad money. Bitcoin (BTC) slides down the list to #54 in terms of M2 money supply, inbetween Bangladesh and Algeria, although Bitcoin (BTC) still has a greater market cap than the M2 money supply of 142 countries.
Thus, even though Bitcoin (BTC) is a relatively small asset class when compared to equities, the value of all the Bitcoins (BTC) in the world is greater than the money supply of most nations.