With a CNBC your money minute, I'm Jessica Ettinger. Did you cut back on your spending in July. Retail sales from June to July dropped the most in a year.>> Retail sales were disappointing, but I think there's some explanatory factors for that. >> That's the Wilmington Trust's Megan Shu on CNBC. June came in strong.Gas prices were falling, but when the US and Iran memorandum of understanding fell apart, gas prices rose again. Economists really aren't sure what happened last month, but Amazon did have its Pr ...