Marc Dunkelman, author of “Why Nothing Works: Who Killed Progress and How to Bring It Back,” looks at why, in his view, America finds it so difficult to do big things. Then, Eileen Mullane of RE, a new store featuring used handbags and more, talks about her business which is now open on Iron Horse Drive. And Stephanie Padilla, owner of Savannah’s Unique Boutique in Junction Commons, highlights her business.