Thursday, November 29, 2012, 7:30 p.m.; Sunday, December 2, 2012, 7:30 a.m.  Many startups base their businesses on changing their customers’ behavior – which can be a challenge. But it doesn’t have to be so hard. The trick is understanding how customers make decisions and how to influence those decisions. In this edition of Smith Business Close-Up, the Smith School’s Rebecca Ratner talks about her experience working with entrepreneurs at Silicon Valley’s behavioral economics summit for startups, StartupOnomics, and the takeaways other businesses can use.