That's right, Germans. They're coming. And we're not referring to Christopher Nolan's bada$$-looking Summer flick, Dunkirk (video). We're talking about Lidl and Aldi, both of which are planning to expand in the US - a prospect that will surely cloud/crowd the grocery space and may push deflated food prices even further downward. Little known fact: there are currently 38k grocery stores in America and the average margin is only 1.25% to 1.5%. Insane.