एडम स्मिथ के अनुसार अर्थशास्त्र मुख्य रूप से किस विषय से सम्बंधित है?

Arrange the following works/theories in chronological order of their original publication: a) Rostow's 'The Stages of Economic Growth' b) Schumpeter's 'The Theory of Economic Development' c) Karl Marx's 'Das Kapital' d) Thomas Malthus's 'An Essay on the Principle of Population'

Arrange the publication of the following economic works in chronological order: a) David Ricardo's 'Principles of Political Economy and Taxation' b) Alfred Marshall's 'Principles of Economics' c) J.S. Mill's 'Essays on Some Unsettled Questions of Political Economy'