As of 2023, 20 countries in Europe had adopted the euro as their common currency. These countries are called the euro zone. According to an article on bloomberg.com, in 2023, “the euro-area economy failed to expand at the end of 2022. . . . Gross domestic product was unchanged from the previous quarter during the final three months of last year.” Is it likely that the article is referring to what happened to nominal GDP or to what happened to real GDP? Briefly explain.