生命周期预算
生命周期预算是指您愿意在一个广告活动的整个投放过程中花费的总金额。一旦您的广告活动达到了您设置的生命周期预算限制，它将停止投放广告。
品牌推广
您可以为生命周期预算设置的最低金额为 $100。 您将在广告活动期间定期支付费用，直到用完广告活动的整个生命周期预算为止。预算会尽可能快地使用，而且不会全天保持同样的速度。这意味着如果有大量买家对您推广的商品感兴趣，那么较小的预算会在几分钟内耗尽。该系统会使您从高流量周期中受益。
在为特定的广告活动选择了每日预算或生命周期预算后，您将无法在这两种预算类型之间切换。要更改品牌推广的预算制定方法，请复制您的广告活动并创建一个新的广告活动。
例如，如果您将投放 10 天的广告活动的生命周期预算设置为 $1,000，亚马逊将每天提供最多 $100 的点击量。如果您在第一天获得了 $90 的点击量，那么第二天的预算则为 $110，以对昨天未达到预算阈值作出弥补。一旦达到 $1,000 的预算上限，您的广告活动将停止投放广告。
注意： 生命周期预算不适用于商品推广活动。
亚马逊官网原文详情：
Lifetime budget
The lifetime budget is the total amount that you are willing to spend on one campaign for as long as it runs. Once your campaign has reached the lifetime budget limit you have set, it will stop running ads.
Sponsored Brands
The minimum amount you can set for a lifetime budget is $100. You will be charged periodically during your campaign until the campaign’s entire lifetime budget is spent. Budgets are spent as quickly as possible and your budget will not be paced throughout the day. This means that a smaller budget could be spent in a few minutes if there are a large number of shoppers interested in your advertised products. This system allows you to benefit from high traffic periods.
You can't switch between a daily budget and a lifetime budget after you have selected one for a particular campaign. To change your budgeting method for a Sponsored Brand, copy your campaign and create a new one.
For example, if you set your lifetime budget to $1,000 for a campaign running for 10 days, Amazon will deliver up to $100 of clicks per day. If you receive $90 in clicks on the first day, the budget the next day will be $110 to make up for not reaching yesterday’s budgeting threshold. Once you reach your cap of $1,000, your campaign will stop serving ads.
Note: Lifetime budgets are not available for Sponsored Products campaigns.
文章来源：亚马逊官方网站
