起源故事 · 高德拉特与《目标》
Origin Story · Goldratt and The Goal
1984 年,物理学家 Eliyahu Goldratt 写了一本不像管理书的小说《目标(The Goal)》。
主角厂长罗哥靠一个登山徒步队的比喻顿悟:队伍的速度由走得最慢的那个胖男孩决定。
工厂的产出,也由那台最慢的瓶颈机床决定。于是经典难题来了 —— 多个产品抢这台机床,该多做哪个?
财务说"做毛利率高的",高德拉特却说:瓶颈上的每一分钟,才是真正稀缺的钱,
要看哪个产品在这一分钟里挣得多。这就是约束理论的产品组合决策。
In 1984 the physicist Eliyahu Goldratt published The Goal — a management book disguised as a novel.
The plant manager Alex has his eureka moment on a Boy Scout hike: the troop's pace is set by the slowest, heaviest kid in line.
A factory's output is set the same way — by the slowest machine. Which leads to the classic question: when several products fight for that one machine, which should you make more of?
Finance answers "the highest-margin one." Goldratt's counter: the truly scarce dollar is the one earned per bottleneck minute —
so rank by which product earns more in that minute. That's the TOC product mix decision.
1 同一座瓶颈,两种排法的利润 One Bottleneck, Two Rules, Two Profits
T / 约束分钟优先Priority by T / constraint min左边两个产品各自的"每约束分钟产出",右边是按当前策略把瓶颈喂满后的产量与总有效产出。切换策略看总利润如何变化。 Left: each product's throughput per constraint minute. Right: the quantity and total throughput when the current rule feeds the bottleneck to the brim. Toggle the rule and watch total profit move.
2 为什么"单位利润高"会骗人 Why "Higher Unit Profit" Lies
产品 A:单位有效产出 90 元,但占瓶颈 30 分钟 → 每分钟仅 3.0 元。
产品 B:单位有效产出 60 元,只占瓶颈 12 分钟 → 每分钟高达 5.0 元。
看单位利润 A 完胜,可在稀缺的瓶颈分钟里,B 才是印钞机。把瓶颈优先喂给 B, 剩余产能再给 A,整厂的钱才最多。这就是"按 T / 约束时间排"而不是"按单位利润排"的全部秘密。 Product A: throughput per unit ¥90, but it hogs the bottleneck for 30 min → only ¥3.0 per minute.
Product B: throughput per unit ¥60, clears the bottleneck in 12 min → a whopping ¥5.0 per minute.
On unit profit A wins hands down — but on scarce bottleneck minutes, B is the money printer. Feed B first, hand A the leftover capacity, and the whole plant earns the most. That's the entire secret behind "rank by T / constraint time," not by unit profit.
产品 B:单位有效产出 60 元,只占瓶颈 12 分钟 → 每分钟高达 5.0 元。
看单位利润 A 完胜,可在稀缺的瓶颈分钟里,B 才是印钞机。把瓶颈优先喂给 B, 剩余产能再给 A,整厂的钱才最多。这就是"按 T / 约束时间排"而不是"按单位利润排"的全部秘密。 Product A: throughput per unit ¥90, but it hogs the bottleneck for 30 min → only ¥3.0 per minute.
Product B: throughput per unit ¥60, clears the bottleneck in 12 min → a whopping ¥5.0 per minute.
On unit profit A wins hands down — but on scarce bottleneck minutes, B is the money printer. Feed B first, hand A the leftover capacity, and the whole plant earns the most. That's the entire secret behind "rank by T / constraint time," not by unit profit.
3 现实里的产品组合决策 Product Mix in the Real World
瓶颈产能分配:注塑机、镀膜炉等关键设备排满时,先排每机时产出最高的订单,而非客单价最高的。
Bottleneck allocation: When injection molders or coating ovens run flat-out, schedule the orders with the highest throughput per machine-hour first — not the highest ticket price.
接单与报价:低价急单只要占瓶颈少、单位时间产出高,照样该接;高价大单若拖垮瓶颈反而要谨慎。
Order intake & quoting: A low-price rush order that barely touches the bottleneck and earns well per minute is worth taking; a high-ticket job that smothers the bottleneck deserves a hard look.
别按毛利率盲排:毛利率/销售额忽略了产品对瓶颈的占用差异,是产品组合最常见的认知陷阱。
Don't blindly rank by margin: Gross margin or revenue ignores how much bottleneck each product consumes — the single most common cognitive trap in product mix.
餐厅与服务业:厨房(瓶颈)忙不过来时,优先出翻台快、毛利贡献高的菜,而非最贵的招牌菜。
Restaurants & services: When the kitchen (the bottleneck) is slammed, push out the dishes with the fastest turn and best contribution — not the most expensive signature plate.
一句话In One Line
系统的产出由约束决定,所以真正稀缺的不是产品、不是钱,而是瓶颈上的那一分钟。
单位利润、毛利率、销售额都把这分钟当成免费的,于是排错了顺序。
约束理论的答案极简:用每约束分钟的有效产出(T / 约束时间)排优先级,
先喂瓶颈最爱吃的,再用剩饭喂别人。当瓶颈被喂满,整座系统的钱就到了顶 ——
这是把局部效率换成全局产出的第一课,下一页讲为什么各部门 100% 努力反而拖垮全局。
System output is set by the constraint, so the truly scarce thing isn't a product or a dollar — it's that one bottleneck minute.
Unit profit, gross margin, revenue all treat that minute as free, which is why they pick the wrong order.
TOC's answer is brutally simple: prioritize by throughput per constraint minute (T / constraint time) —
feed the bottleneck what it likes most, then hand the leftovers to everyone else. Fill the bottleneck and the whole system tops out on money.
That's lesson one of trading local efficiency for global throughput. Next page: why a "100% effort" KPI in every department actually drags the whole plant down.
常见误用Common Mistakes
按单位利润 / 毛利率排产。在瓶颈受限时,按 T / 约束分钟排,否则把稀缺产能喂给了低效产品。
Scheduling by unit profit or gross margin. When the bottleneck binds, rank by T / constraint minute — otherwise you feed scarce capacity to the wrong product.
对所有产品一律用同一指标。只有占用瓶颈的产品才比"每约束分钟";不占瓶颈的尽管多做。
Using one rule for every product. Only products that touch the bottleneck need ranking by T / constraint minute — anything that bypasses the constraint, just make more of.
用全分摊成本算"真实利润"再排。用有效产出 T(售价−完全可变成本),固定费用不随单件变化。
Allocating fixed overhead to get "true profit" and ranking on that. Use throughput T (price − totally variable cost). Fixed costs don't move with the next unit, so they don't belong in the ranking.