Q: Does "fail" have the same meaning in the following two sentences?

I fail to understand your motives.

A number of banks failed that year.

A: different meanings

Q: Does "trade" have the same meaning in the following two sentences?

They are accused of conspiring to constrain trade.

Venice was an important center of trade with the East.

A: the same meaning

Q: Does "concern" have the same meaning in the following two sentences?

The employees' attitude is really hurting the concern.

A racially integrated business concern.

A:
the same meaning