The real wordsTheory
The four subsystems
The slide's own sentence, and it is the frame for everything below.
Financial systemA set of sub systems of financial institutions, markets, instruments and services. It intermediates with the flow of funds between savers and borrowers, and facilitates the transfer and allocation of scarce resources efficiently and effectively.
Four subsystems. The professor's own deck widens the list to six: institutions, markets, services, instruments, practices and transactions. Give four if asked for the subsystems, and mention the extra two as the fuller version.