A Feb. 28 grassroots campaign is calling for a no-shopping boycott on all major retailers. Here's why (and if it will actually work).

A grassroots movement's "economic blackout" calls on consumers nationwide to avoid shopping at major retailers Friday in protest of corporate greed. Why it matters: The 24-hour boycott, organized by The People's Union USA,

Walmart (WMT), or Target (TGT) on February 28 — at least, if you’re complying with “Economic Blackout Day.” Peoples Union USA, a grassroots consumer organization, is calling for no commerce from major retailers — including anything online,