Purchasing economies
large firms that buy lots of resources get cheaper rates
Marketing economies
Marketing costs can be spread over more units of output for a larger firm
Technical economies
larger firms have access to better technology, which reduces average costs.
Financial economies
larger firms can get access to money more cheaply.
Managerial economies
larger firms can afford specialist managers
Risk-bearing economies
larger firms are more likely to have wider product ranges and sell into a wider variety of markets to reduce risk.