A bitcoin wallet stores the private keys required to make bitcoin transactions. While a bitcoin wallet is somewhat similar to a more traditional wallet, there are important differences.
Wherever commerce occurs, the exchange takes place in a market. Securities require actual or figurative (in person or digital) markets for transactions. Globally, securities markets give a place for exchange, and can be centralized, such as the NYSE, or decentralized, as in the forex market. Read more about global markets and the indices and exchanges that populate them.