Unearned income refers to income received by virtue of owning property (known as property income), inheritance, pensions and payments received from public welfare. The three major forms of unearned income based on property ownership are rent, received from the ownership of natural resources; interest, received by virtue of owning financial assets; and profit, received from the ownership of capital equipment. As such, unearned income is often categorized as "passive income".
Unearned income refers to income received by virtue of owning property (known as property income), inheritance, pensions and payments received from public welfare. The three major forms of unearned income based on property ownership are rent, received from the ownership of natural resources; interest, received by virtue of owning financial assets; and profit, received from the ownership of capital equipment. As such, unearned income is often categorized as "passive income".
https://en.wikipedia.org/wiki/Unearned_income
This covers the policy debate part, which you may be referring to:
https://en.wikipedia.org/wiki/Unearned_income#Taxation