Based on the description of a continuum from "centrally planned" to "free market," Hong Kong would be farthest to the right on the continuum of mixed economies.
Hong Kong has historically been known for its free-market economy, with minimal government intervention, especially in trade and commerce. The United Kingdom and South Africa also have mixed economies but lean more towards government regulation than Hong Kong. North Korea, on the other hand, is a centrally planned economy and would be farthest to the left.