I want to know the answer to the following question:
Mahbub ul Haq and Amartya Sen pioneered what approach?
All the background I'm provided with is that "The capability approach, pioneered by economists Mahbub ul Haq and Amartya Sen and further developed by legal scholar Martha Nussbaum, understands freedom under allied lines: the real-world ability to act.". Is that enough to answer the question?
Answer: yes