The '''Multiplier–accelerator model''' is a [[macroeconomic model]] which explains what might causeanalyzes [[Business cycle|cycles]].<ref name="Edward 2008">{{Cite book|author=Edward E. Leamer |year=2008 |title=[https://books.google.fr/books?id=XObELQuIWv8C&pg=PA158&dq=Multiplier%E2%80%93accelerator+model&hl=fr&sa=X&ved=0CEQQ6AEwBWoVChMIz6vgmoGGxgIVjDwUCh1chgDg#v=onepage&q=Multiplier%E2%80%93accelerator%20model&f=false Macroeconomic Patterns and Stories]|publisher=Springer Science & Business Media |page=158 }}</ref> This model was developed by [[Paul Samuelson]] in {{harvtxt|Samuelson, P.A.|1939}}.<ref name="Edward 2008" /><ref name="Mullineux 1984" /> This model is based on the Keynesian [[multiplier (economics)|multiplier]] and the [[Accelerator effect|accelerator theory of investment]].
