    Does Startup Density Predict Success?  
By Alex,  feefighters.com  
 Accord­ing to Paul Gra­ham, start­up den­si­ty is what saves star­tups in places like Sil­i­con Val­ley, as it pro­vides:  An environment that encourages startups • Chance meetings with helpful people • A social norm of optimism  Now, the… 
 
 Exactly  