T-Mobile’s $22.1 million disadvantage to AT&T; Arby’s pays more than Burger King
Market concentration, price and quality drive choice of firms
            
    
    
  
Do for-profit supermarket chains tolerate higher-priced co-ops?
VC money for tech pushes up costs for everyone else
            
    
    
  
With a business model built on fewer employees, their dominance saps dynamism.
            
    
    
  
Researchers refute earlier claims