Coming-out parties for debutantes have long gone out of fashion. But countries still have coming-out parties when they reach a certain level of income and development, and feel they need to make a statement to the world. That urge seems to come after per capita income reaches about $4,000, calculated using purchasing power parity and 1990 international dollars (the number would be higher with subsequent iterations of international dollars). And the party usually means hosting the summer Olympics.
In fact, when the modern Olympic movement was conceived in the final decade of the 19th century, the wealthier Western European countries and the United States were approaching the $4,000 mark or around it: Other than Greece, which was the first host on account of its ancient Olympics, the hosts were France, the US, Britain, Sweden, and then Germany (for 1916, but aborted by World War I). Angus Maddison calculates a per capita income of $3,473 for Western Europe as a whole in 1913, including the poorer Southern Europe.