Belgian economist Alexandre Lamfalussy, who headed the institution that became the European Central Bank and was credited as one of the founders of the shared euro currency, has died at age 86. […] Lamfalussy headed the Frankfurt-based European Monetary Institute from 1994-97. The institute laid the groundwork for the creation of a supranational central bank to manage the new currency. The institute became the European Central Bank in July 1998, under its first president, Wim Duisenberg. The euro was introduced on Jan. 1, 1999, with 11 member countries. …