Rising acquisition costs are structural, not a glitch. Four moves that defend margin without cutting growth.获客成本上涨是结构性的，不是故障。四个既守利润、又不砍增长的动作。
CAC has risen across nearly every channel for five straight years. More advertisers, finite attention, and tighter signal all push the same direction. If your plan assumes last year’s costs, your plan is already wrong.几乎所有渠道的获客成本，已经连涨五年。广告主更多、注意力有限、信号更紧——都把成本推向同一个方向。如果你的计划还按去年的成本来算，它已经错了。
Move one: defend LTV, not just CAC. A 20% lift in retention does more for your unit economics than a 20% cut in CAC, and it is usually easier to win. Connect paid media to lifecycle from day one.动作一：守住 LTV，而不只是 CAC。留存提升 20% 对单位经济的贡献，超过 CAC 下降 20%，而且通常更容易实现。从第一天起就把投放和生命周期渠道打通。
Move two: spend more on creative, not media. When auction prices rise, the cheapest performance gain left is a better ad. We routinely see a new creative angle drop CPA more than any bid change could.动作二：把钱花在素材上，而不是媒介上。当竞价价格上涨，剩下最便宜的提升，就是一条更好的广告。我们经常看到，一个新素材角度对 CPA 的拉低，超过任何出价调整能做到的。
Move three: measure incrementally, so you stop paying for conversions you would have gotten free. Move four: pick your battles — concentrate budget where you have a real edge instead of spreading thin across every shiny channel.动作三：做增量度量，别再为本来免费就能拿到的转化付费。动作四：挑你的战场——把预算集中在你真有优势的地方，而不是摊薄到每一个看起来很闪的渠道上。