Explain why one can write the demand for money as the price level times a function of the interest rate and real income as follows: 
= PxL (R, Y)
Definitions:
Trade Network
A trade network is a complex system of economic exchange involving the movement of goods and services across different regions or countries.
Public Utilities
Companies or organizations that provide essential services such as water, electricity, natural gas, and telecommunications to the public, typically subject to government regulation.
Civitas
A Latin term used in ancient Rome to refer to the body of citizens who constituted the city as a legal entity, as well as the citizenship and rights associated with it.
Mohenjo-Daro
An archaeological site in Pakistan, belonging to the Indus Valley Civilization, notable for its advanced urban planning.
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