Financial Questions

Hi, can someone please help me with these questions thanks.

1- Equity financing might be obtained from various sources such as personal money, household, associates, families, venture capital or going public by issuing Initial Public offerings.

Is there a limit as to just how much equity financing a firm can do?

2- All investors use options to play in the stock market. 

What's the difference between owning an option in Disney versus owning the actual Disney stock?

3- The supply chain needs to be thought of globally and not just locally.  

Does this type of thinking become more difficult when the firm expands globally?