The actual harm of that policy had a serious impact on the economy.

His actions exerted a great influence on our plans.

His opinion had a big influence on my decision.

That news greatly influenced his opinion.

This problem is very serious.

Do you understand the seriousness of this problem?

This policy is necessary to stimulate the economy.

He is an expert in economics.

His words had a great influence.

The environmental issues are becoming more serious.