Varroa mites have been causing serious problems in bee colonies in the United States since the late nineteen eighties.

VOA: special.2009.09.22

"because the virus can spread rapidly, but what we're seeing so far is a pretty stable position as far as the virus is concerned, it's producing relatively mild illness in most people, but in a small proportion it's causing serious problems and we have in place the plans in our health care system to deal with those problems,".

VOA: standard.2009.07.31

Mr Milburn said the blockade was causing serious problems for NHS staff and patients.

BBC: You are in: Health

This is our old friend, "helicopter money", which Wadhwani believes could help boost economic activity without causing serious problems for inflation. (In fact, he first proposed this with another economist Michael Dicks in 2011).

BBC: On markets and helicopters

Potential growth is the maximum growth rate an economy could achieve without causing serious overheating problems.

FORBES: Estimating China's New Growth Potential