A developed or an advanced market in investing terms is a country that is most developed in terms of its economy and financial markets.
There are three categories of economies: developed or advanced, emerging and frontier. A developed economy is considered to be stable and have a relatively high level of economic growth. Its capital markets are developed, with a high level of regulation and oversight, a market exchange, and good liquidity in its debt and equity markets.
Developed markets are mostly found in North America, Western Europe and Australasia, and include the UK, US, Canada, France, Germany, Italy, Japan and Australia.