'Reaganomic Policy' involves cutting government spending, reducing marginal tax rates on income, reduction of regulation, and control of money supply to control inflation.
That is essentially Republican policy, but it was proposed in general by many Democratic legislators before his term.

Reagan took credit for reducing regulation, but it had started before him- airlines and trucking by Carter, as well as reduction of regulation in banking, natural gas, telephones, railroads, etc.

(Reagan, however, authorized heavy spending, so hardly a practitioner of his stated policy)