In portfolio management terms, what is a regime change and why are regime changes important?
A. A regime change is when one or more key underlying drivers and/or relationships of particular investments change, causing the risks, returns, and correlations of one or more Asset Classes to change which in turn has a strong tendency to affect capital market and portfolio returns, often at times and in ways not predicted by at least some Active investors.
B. A regime change is when the rulers of a country are replaced by a new group and this has a strong tendency to affect capital market returns in that country.
C. A regime change is when one or more key underlying drivers and/or relationships of particular investments change, causing the risks, returns, and correlations of one or more Asset Classes to change but these are not important for Active investors because they want to maintain their longterm strategic allocation weightings and do not try to predict or react to regime changes.