Parks Associates reports an estimated 23 million US households move every 18 months. In that same timeframe, 20% of these households have purchased a traditional tube TV, 16% have purchased a flat-panel LCD TV, 7% have purchased an HD traditional tube TV, and 8% have purchased a flat-panel plasma. Among households that have not moved in the past 18 months, only 14% have recently purchased a traditional tube TV, 13% have purchased a flat-panel LCD TV, 5% have purchased an HD traditional tube TV, and 5% have purchased a flat-panel plasma.