Since its inception the euro has brought about revolutionary changes in European finance. For example,

Multiple Choice

by redenominating corporate bonds and stocks from several different currencies into one common currency, the euro has precipitated the emergence of continent$-$wide capital markets in Europe that are comparable to U$.$S$.$ markets in depth and liquidity.

Swiss bank accounts are all denominated in euro.

the European banking sector has become much more important as a source of financing for European firms.

there have actually not been any revolutionary changes.