The Market for Capital (the Loanable Funds Market) and the Crowding Out Effect. An increase in government deficit spending "crowds out" private investment by increasing interest rates and lowering the quantity of capital available to the private sector.
Total revenue from direct and indirect taxes given as share of GDP in 2017
The IS curve shifts to the right, increasing real interest rates (r) and expansion in the "real" economy (real GDP, or Y).
Tax Burden as a Percentage of GDP (2014 Index of Economic Freedom).
Pieter Brueghel the Younger, The tax collector's office, 1640
Government spending as percentage of GDP in different countries, 1890 to 2011
Substitution effect and income effect with a taxation on y good.
Government Expenditure as a Percentage of GDP (2014 Index of Economic Freedom).
Budget's constraint shift after an introduction of a lump sum tax or a general tax on consumption or a proportional income tax.
The Laffer curve. In this case, the critical point is at a tax rate of 70%. Revenue increases until this peak, then it starts decreasing.
General government revenue, in % of GDP, from social contributions. For this data, the variance of GDP per capita with purchasing power parity (PPP) is explained in 20% by social contributions revenue.
Egyptian peasants seized for non-payment of taxes. (Pyramid Age)
Public finance revenue from taxes in % of GDP. For this data, the variance of GDP per capita with purchasing power parity (PPP) is explained in 32% by tax revenue.
Diagram illustrating deadweight costs of taxes

A tax is a compulsory financial charge or some other type of levy imposed on a taxpayer (an individual or legal entity) by a governmental organization in order to fund government spending and various public expenditures (regional, local, or national), and tax compliance refers to policy actions and individual behaviour aimed at ensuring that taxpayers are paying the right amount of tax at the right time and securing the correct tax allowances and tax reliefs.

- Tax

In economics and political science, fiscal policy is the use of government revenue collection (taxes or tax cuts) and expenditure to influence a country's economy.

- Fiscal policy

Government spending can be financed by government borrowing, taxes, custom duties, the sale or lease of natural resources, and various fees like national park entry fees or licensing fees.

- Government spending

Changes in government spending is a major component of fiscal policy used to stabilize the macroeconomic business cycle.

- Government spending

In addition, taxes are applied to fund foreign aid and military ventures, to influence the macroeconomic performance of the economy (a government's strategy for doing this is called its fiscal policy; see also tax exemption), or to modify patterns of consumption or employment within an economy, by making some classes of the transaction more or less attractive.

- Tax
The Market for Capital (the Loanable Funds Market) and the Crowding Out Effect. An increase in government deficit spending "crowds out" private investment by increasing interest rates and lowering the quantity of capital available to the private sector.

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