Without agar, countries could not produce vaccines or the “miracle drug” penicillin, especially critical in wartime. In fact, they risked a “breakdown of [the] public health service” that would have had “far-reaching and serious results,” according to Lieutenant-General Ernest Bradfield. Extracted from marine algae and solidified into a jelly-like substrate, agar provides the surface on which scientists grow colonies of microbes for vaccine production and antibiotic testing. “The most important service that agar renders to mankind, in war or in peace, is as a bacteriological culture medium,” wrote oceanographer C.K. Tseng in a 1944 essay titled “A Seaweed Goes to War.”3
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但广告化并不天然等于价值创造。当所有商户都必须通过竞价才能被看到时，广告费便从增量工具演化为入场券。单个商户的理性选择，是继续加价以维持原有订单量；但从整体看，供给侧为此付出的总成本却在不断上升，而需求并未同步扩大。平台收入提高，但供给侧整体并未获得更多有效需求，反而陷入内耗式竞价。这种结构下，广告化更像是将抽佣换了一种更隐蔽的形态，甚至加剧了零和博弈。，更多细节参见heLLoword翻译官方下载
Bill Gurley says that right now, the worst thing you can do for your career is play it safe