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Source: The Startup Owner’s Manual (2012), p. 77.
Out of Control: The New Biology of Machines, Social Systems and the Economic World (1995), New Rules for the New Economy: 10 Radical Strategies for a Connected World (1999)
“Spend your money on the things money can buy. Spend your time on the things money can’t buy.”
Source: The Wind-Up Bird Chronicle
“Whoever said money can't buy happiness wasn't spending it helping people who needed it.”
Official Website (2009)
                                
                                    “Buy a pup and your money will buy
Love unflinching that cannot lie.”
                                
                                
                                
                                
                            
                                        
                                        Cf. LOOK Magazine 1957: Actor Walter Slezak's version of "keeping up with the Joneses": "Spending money you don't have for things you don't need to impress people you don't like."  p. 10 books.google http://books.google.com/books?id=-NERAQAAMAAJ&q=slezak. 
Misattributed
                                    
Source: Designing Social Systems in a Changing World (1996), p. 121; Banathy is self-citing a 1991 publication
                                        
                                         Twitter https://twitter.com/marwilliamson (24 Nov 2019) 
Williamson's quotes in social media
                                    
 
                            
                        
                        
                         
                            
                        
                        
                         
                            
                        
                        
                         
                            
                        
                        
                         
                            
                        
                        
                        