Economists also suggest different policy responses to correct or reduce market failure. Some of the policy responses are taxes, subsidies, regulations, standards, quotas, licenses, public provision, public-private partnerships, and market-based instruments. Taxes are the charges imposed by the government on the producers or consumers of a good or service to internalize the external costs or reduce the demand. Subsidies are the payments made by the government to the producers or consumers of a good or service to internalize the external benefits or increase the supply. Regulations are the rules or laws that restrict or control the behavior or actions of the market agents. Standards are the minimum or maximum levels of quality, quantity, or performance that the market agents have to meet or comply with. Quotas are the limits or restrictions on the quantity or share of a good or service that can be produced or consumed. Licenses are the permits or authorizations that grant the right or privilege to produce or consume a good or service. Public provision is the production or delivery of a good or service by the government or a public entity. Public-private partnerships are the arrangements or agreements between the government and a private entity to jointly provide a good or service. Market-based instruments are the mechanisms or schemes that use market signals or incentives to influence the behavior or actions of the market agents, such as tradable permits, auctions, or vouchers.