Mega-cap companies are generally thought of as those whose total value of all shares in issue is above $100bn. For context, that is more than four times the size by market capitalisation of Africa’s biggest bank, FirstRand.  

To become gigantic, companies generally need to have had something special. Whether this something special will continue is key to determining which mega-cap firms may make good long-term investments. So what are the shared desirable characteristics?..

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