I had no idea in 1933 what economics was, but I did well in the subject from the start, and when I graduated in 1937 with first class honours LSE gave me a scholarship to do a PhD in industrial economics.
Lewis (1979). "Sir Arthur Lewis - Biographical," cited in: Toporowski, Jan. "Sir William Arthur Lewis (1915–91)." Fifty Key Thinkers on Development (2006): 144.