Why are informal practices still prevalent in Russia? -- Chernyi piar : dirty campaigning and the workings of Russian democracy -- Kompromat : the use of compromising information in informal politics -- Krugovaia poruka : sustaining the ties of joint responsibility -- Tenevoi barter : shadow...

Introduction -- Networks : concepts and empirics -- Games on networks -- Coordination and cooperation -- Social learning -- Social networks in labor markets -- Strategic network formation : concepts -- One-sided link formation -- Two-sided link formation -- Research collaboration among firms