In Summer 2022, Germany introduced an unprecedented reduction in public transport fares, the so-called 9-Euro Ticket, which granted nationwide access to public transport for just 9 Euros per month—recently followed up by the “DeutschlandTicket” program for 49 Euros per month. An analysis by RWI–Leibniz Institute for Economic Research and Yale University shows that the 9-Euro Ticket had little impact on car use.
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Source: Phys.org