There are different possible strategies to improve both the efficiency and the effectiveness of decision-making in the public and in the private sector. The value added of behavioural insights is that measures are often very cheap and simple to implement.
For instance, policy-makers can dramatically improve tax compliance rates through social norm statements and deterrence messages, as shown in these two interesting studies from the World Bank and the Behavioural Insight Group.
It is nowadays crucial that decision-makers understand the strategic importance of investing in these type of studies and measures, as already did the UK cabinet and Costa Rica and Nicaragua authorities.