FROM Zimbabwe's capital Harare to Quito in Ecuador, green bills circulating on the streets and in shops with images of U.S. presidents reflect a big choice that has been made: picking the dollar over the local currency to bring economic stability. The two countries offer a lesson - and warnings - for Argentina, the latest nation globally to toy with the idea of ditching an embattled local tender in favour of the greenback, a signature campaign pledge of President-elect Javier Milei. Dollarization or the part-way option of a peg to the dollar has generally been triggered as a last-ditch option to…