Definitions: (1) the most important; chief; principal; notable; (2) very good; excellent; first-class; (3) any thing that confers value or benefit to its owner

• The accumulation of cultural capital – the acquisition of knowledge – is the key to social mobility. — Michael Gove (1967-) British politician
• Politeness and civility are the best capital ever invested in business. The truth is, the more kind and liberal a man is, the more generous will be the patronage bestowed upon him. Phineas Taylor [P. T.] Barnum (1810–1891) American showman & philanthropist

Comment: If you have a capital idea, you can parley it into enough capital to built a capitol building.