The problems of the market are often reflected in problems in political systems. The short-termism of the way markets often function, creating instability for business and for whole national economies can unfortunately be amplified by the short-termism of democratic political systems.
To enable businesses to function more sustainably, mechanisms to encourage long-term thinking should be introduced.
Are our structures of economic decision-making fit for purpose? That depends on what the purpose is, of course. If decisions need to be made for the long-term, and if they should take into account a balance of different interests and concerns, which they should, then the answer has surely got to be no.