Good question Pradyut, 1) Typically when you say Google is a $250 billion company you are referring to its market cap and not revenue.
Oct 10 2012 11:50 AM
2) Depreciation and Amortization are accounting methods to match expenses to the time period in which they are used. So for example if your company buys a machine for Rs.1 crore, then you wont expense the entire amount this year since you might use the machine for 5 years - hence you will expenses Rs. 25 lakhs each year.
Depreciation is used for tangible items such as machinery, infrastructure etc,. Amortization is used for intangibles like intellectual property etc.