Doctors are taught to provide an "opinion". Of the myriad of choices, the doctor will choose one to tell the patient. Doctors tend to gloss over the actual evidence or reasoning behind their choice.
In contrast, economists are very reticent to actually state which choice they prefer. Economists tend to focus on explaining the costs and benefits of various choices, leaving it to the decision maker to do the actual weighing and making the final decision.
In medicine only way to get multiple choices is to have multiple doctors with different opinions. How then to choose between the opinions?
In policy making the only way to get an opinion is to find a "one handed economists".
