If we compare the crypto assets market to the stocks markets in general, can Bitcoin be considerated as the equivalent of the dollar?
In the stock exchage we buy shares with dollars.
In the cryptocurrencies exchanges we buy tokens or coins with bitcoins(and other cryptocurrencies, Litecoins, etc).
Maybe, if you equate the real world with the crypto world. Because in the real world we can buy anything with dollars, and in the crypto world we can buy all altcoin with bitcoin. But if you equate dollars with bitcoin in the real world, it must be different and not the same.