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                                                                                    Working Paper
                                                                                
                                            Automation and the Rise of Superstar Firms
                                        
                                        
                                        
                                        
                                                                                    
                                                                                                    Using an instrumental variable approach, we document evidence that the rise in automation technology contributed to the rise of superstar firms. We explain this empirical link in a general equilibrium framework with heterogeneous firms and variable markups. Firms can operate a labor-only technology or, by paying a per-period fixed cost, an automation technology that uses both workers and robots. Given the fixed cost, larger and more productive firms are more likely to automate. Automation boosts labor productivity, enabling those large automating firms to expand further, and thus raising ...