Foreign currencies like the US dollar and South African rand have been used for most transactions since 2009.
Local dollars are not used except high-denomination notes sold as souvenirs.
But from Monday, Zimbabweans can exchange bank accounts of up to 175 quadrillion (175,000,000,000,000,000) Zimbabwean dollars for five US dollars.
Higher balances will be exchanged at a rate of Z$35 quadrillion to US$1. MORE: www.bbc.com