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This article uses previously under-exploited quantitative and qualitative primary sources in Hong Kong, the US, and the UK to chronicle how radio broadcast technologies extended in a Less Developed Country. As incomes were rising and the price of radio receiving sets was falling, demand-side forces were strong in Hong Kong. Yet, these forces alone cannot explain the pattern of diffusion observed. Innovations accelerated the take-up of radios. The liberalization and de-regulation of radio broadcasting provided pre-requisites for these supply-side shifts.