Cait Lamberton, a Wharton marketing professor, offers insight into holiday spending and consumer confidence as the uncertain economic outlook looms over the upcoming Black Friday. Meanwhile, culinary historian Sarah Lohman has embarked on a journey to uncover rare foods at risk of extinction in her new book “Endangered Eating.” She talks about the importance of bringing heirloom foods back to our tables. On Tuesday, the WHYY podcast “Art Outside” is set to debut, focusing on Philadelphia’s public art scene. Hosted by Conrad Benner, the series will feature five street artists and explore their impact and motivation for creating outdoor art. The first episode will spotlight an artist known as “the Philadelphia Bansky,” who is taking on the Philadelphia Parking Authority with his art.