difference b/w inter firm and intra firm

The word 'inter' means between and 'intra' means within. 

Inter firm means between two or more firms. For example, in accounting inter firm comparisons are conducted to judge efficient and inefficient firms. Also, the profitability and prospects of different firms is forecasted using inter firm comparison.

Intra firm means within an organisation. For example, when comparisons are conducted within the different departments of the same firm or comparing performance of the same firm with its previous years' results is intra firm comparison.