What is Central bank?
A '''central bank''' (or '''reserve bank''') manages a [[State (polity)|state's]] [[currency]], [[money supply]], and [[interest rate]]s. It may have custody of the country's [[sovereign wealth fund]]. Central banks usually oversee the [[bank|commercial banks]] of their country. It issues the national [[currency]], the nation's money.<ref>{{cite book |last= Sullivan |first= Arthur |author2= Steven M. Sheffrin |title= Economics: Principles in action |publisher= Prentice Hall |year= 2003 |pages= 254 |url= https://www.savvas.com/index.cfm?locator=PSZu4y&PMDBSOLUTIONID=6724&PMDBSITEID=2781&PMDBCATEGORYID=815&PMDBSUBSOLUTIONID=&PMDBSUBJECTAREAID=&PMDBSUBCATEGORYID=24843&PMDbProgramId=23061 |isbn= 0-13-063085-3 |access-date= 2021-02-26 |archive-date= 2021-03-04 |archive-url= https://web.archive.org/web/20210304124636/https://www.savvas.com/index.cfm?locator=PSZu4y&PMDbSiteId=2781&PMDbSolutionId=6724&PMDbSubSolutionId=&PMDbCategoryId=815&PMDbSubCategoryId=24843&PMDbSubjectAreaId=&PMDbProgramId=23061 |url-status= dead }}</ref> It controls the overall supply of money. In contrast to a commercial bank, a central bank can increase or decrease the amount of money in the nation. The oldest central bank is the [[Bank of England]]. The largest banks are now the [[European Central Bank]] (ECB) and the [[Federal Reserve]] of the United States.<ref>{{cite web |url=http://federalreserveeducation.org/about-the-fed/structure-and-functions/ |title=The structure of the Federal Reserve System |publisher=federalreserveeducation.org |access-date=1 October 2010 |archive-date=3 October 2010 |archive-url=https://web.archive.org/web/20101003124100/http://www.federalreserveeducation.org/about%2Dthe%2Dfed/structure%2Dand%2Dfunctions/ |url-status=dead }}</ref> Central banks usually also have supervisory powers. These powers are meant to prevent [[bank run]]s, and to stop commercial banks and other financial institutions doing reckless or fraudulent things. The relation between central banks and governments varies from country to country. Th