What is the current and future state of the economy of Africa?

In March 2013, Africa was identified as the world's poorest inhabited continent; however, the World Bank expects that most African countries will reach "middle income" status (defined as at least US$1,025 per person a year) by 2025 if current growth rates continue.  There are a number of reasons for Africa's poor economy: historically, even though Africa had a number of empires trading with many parts of the world, many people lived in rural societies; in addition, European colonization and the later Cold War created political, economic and social instability.

However, as of 2013 Africa was the world's fastest-growing continent at 5.6% a year, and GDP is expected to rise by an average of over 6% a year between 2013 and 2023.  In 2017, the African Development Bank reported Africa to be the world's second-fastest growing economy, and estimates that average growth will rebound to 3.4% in 2017, while growth is expected to increase by 4.3% in 2018.  Growth has been present throughout the continent, with over one-third of African countries posting 6% or higher growth rates, and another 40% growing between 4% to 6% per year.  Several international business observers have also named Africa as the future economic growth engine of the world.