Limitations in model construction caused by difficulties in understanding the underlying mechanisms of the real economy.

Plagued by political difficulties the empire did not last and the region came once again under Byzantine control in early 14th century.

The inhabitants of Waterloo wished to rebuild it but were prevented from doing so by financial difficulties.

However since 1997, club found themselves slipping further and further down the table, which influenced by financial difficulties.

Some also told of a terrible hardship made even worse by difficulties encountered in motels and hotels where they were put up for the night.

But its panacea is a deceptive one; those who do drink tend to find the peace so gained offset by new difficulties.

Though plagued by poor health and personal difficulties, Burton remained active as a painter into his eighties.

In the early 1990's, he designed a new American Center here, but the center was forced to close by financial difficulties in 1996.

Though plagued by difficulties, the powder mill remained active into the 1790s.

The man's lean body had been worn leaner by much recent travel and other difficulties.