In order to encourage the citizens to save, the government sometimes apply some strict economic policies like spending cuts, tax increases, or a combination of both; these practices are known as "Austerity Measures".
Tax increases can help reduce consumption; and other balancing stimulus can also be presented, like raising the retirement age for younger members of the population while creating short-term expending programs.
And sometimes in collaboration with the private sector the government launches or subsidizes pension programs , to encourage citizens to voluntarily save for their retirements.
The government can also use regulatory approaches (sometimes called "command-and-control") or economic incentives to correct for consumer behaviors.