Walmart and wages, Post Office same day delivery and Uber doubles down on 'eats'

U.S. stocks (^DJI, ^GSPC, ^IXIC) are doing their best to get back to flat after China's latest market slide and more housing data. China's Shanghai Composite dropped by more than 6% overnight as investors feared more yuan devaluation might be in the offing.

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Here are some of the other stories Yahoo Finance is keeping and eye on today.

Walmart and wages
Walmart (WMT) reported earnings of $1.08 a share, missing estimates by four cents, while revenue of $120.2 billion beat Wall Street's estimates. The earnings miss is being blamed, at least in part, on the company's increase in worker pay as well as a reinvestment in the stores themselves.

United States Grocery Service?
The United States Postal service reported a loss of $5.5 billion last year and Postmaster General Megan Brennan is looking for new ways to complete in a crowded space. One of them is same-day delivery. Here in New York City, postal workers have taken to delivering seafood to restaurants and bottled water to stores in just a matter of hours. Can it work elsewhere and save mail delivery?

Part-time preference
Over six million Americans are choosing to work part-time, according to the Bureau of Labor Statistics. Many of them are college educated Americans who are working just enough to pay the bills and are pursuing a passion or a startup on the side.

Name your own price!
It's lunch time. How much was your meal really worth? Well one restaurant will let you decide. Blu in Montclair, New Jersey has adopted a "pay what you want" model for the month of August. The restaurant's owner decided to run the experiment as a way to thank the community.