1. The reason why the other name for the central problem in an economy "How to produce" is the "Problem of choice of techniques" is because this aspect of the central problem deals with deciding which specific methods or techniques should be employed for the production of goods and services.  

 2. This decision is crucial as it directly impacts the efficiency, cost-effectiveness, and overall productivity of the economy.

Options (1) Problem of Allocation of Resources and (2) Problem of distribution are associated with different aspects of the central problems in an economy and do not specifically address the issue of selecting production techniques.

Therefore, the correct answer is (4) Problem of choice of techniques.