They then no longer required a fresh supply of spikes.

Maintaining this higher level requires a supply of water.

According to this argument, a justified belief requires an endless supply of reasons.

High mortality rate required a constant supply of workers.

By 1870, several railroad lines stretched across the state, each requiring a constant supply of coal.

The first method requires a supply of reasonable quality gold and a torch (among other things).

Warriors require a constant, uninterrupted supply of food and weapons.

At the same time, industrial development in southern Quebec required a larger electric supply.

This means the scheme requires an infinite supply of new suckers.

The rich, as Voltaire said, require an abundant supply of poor.