A bicycle maker may turn out fantastic handlebars but if his supplier produces wonky wheels (or no wheels at all, because of a strike or other disruption), he will not sell a single bike.

• 一家自行车制造商也许能够生产上乘的把手，但如果供应商提供的轮子质量低下（或者由于罢工或其他原因无法提供轮子），那最后可能连一辆自行车都卖不出去。