Operations & Systems.

A random arrival is more likely to land in a long gap than a short one.

An extra shortcut can make selfish routing slower for everyone.

A part that cannot be sped up limits the gain from adding more workers.

More items in a stable process usually means a longer time spent inside it.

Small customer changes can become larger swings in upstream orders.

A project can take longer than the inside-view estimate suggests.

A nearby, larger target is generally easier to reach.

Too many separate permissions can leave a useful resource unused.

A smaller inflow can still leave a stock growing.