RetailWire asked its BrainTrust panel of retailing experts what they thought of the potential of the Walmart Express format as well as its impact on the competitive landscape.

FORBES: Walmart Testing Express C-Store Concept

The retail giant, which rose to dominance with 185, 000-foot Supercenters, plans to open its first Walmart Express store in the second quarter of this year, though it won't say where.

WSJ: As Big Boxes Shrink, They Also Rethink

American Express is charging Walmart less than what debit card-issuing banks like Bank of America, JPMorgan Chase and Citi and Wells Fargo would charge Walmart via debit card swipe fees.

FORBES: Bove: Is Walmart's Banking Business Legal?

Walmart did a deal with American Express, which has made a massive investment to market its nascent prepaid capabilities, and dealt a massive blow to the value of Green Dot.

FORBES: Bluebird vs Greendot. Prepaid wins.

American Express would not disclose terms of the economic agreement with Walmart.

FORBES: Walmart Targets Unhappy Bank Customers With New Prepaid Card--Should Big Banks Be Nervous?

Today Walmart announced an alternative to traditional debit and checking accounts in partnership with American Express.

FORBES: Walmart Targets Unhappy Bank Customers With New Prepaid Card--Should Big Banks Be Nervous?