免費，其實是最貴的！為什麼你離不開免費 App？大腦多巴胺與經濟學的完美圈套
Synopsis
每天都在用免費的Dropbox、Spotify 和Skype，但你真的以為科技巨頭在做慈善嗎？其實，當我們享受「免費」帶來的多巴胺狂歡時 ...
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