The final class of issues arises when we seek to implement the model empirically.

An elite slave-owning class arose that wielded disproportionate political and economic power.

With the old nobility excluded from power, a new class of mercantile house arose.

To meet this challenge the fermat, a new class of machine able to operate beyond the billion bracket, arose.

By 1880 a new middle class had arisen in India and spread thinly across the country.

No new class capable of leading the struggle and heading it towards power had yet arisen.

A new class, which became the landed gentry, arose and their newfound wealth led to an explosion in house building.

This professional class of guides arose in the middle of the 19th century when Alpine climbing became recognized as a sport.

Since agriculture was the main economic activity, an expanding class of discontented, landless poor arose.

An entirely new class of counselors has suddenly arisen to treat this recent "disorder."