### Comment:
With a Spread you Buy and Sell the same amount of calls or puts, so they are used against each other.  
  
 I suggest you read up on spreads a bit, for example: https://www.schwab.com/resource-center/insights/content/reducing-risk-with-credit-spread-options-strategy-0 
  
 For collateral on selling naked calls/puts I think that is determined by the broker so I am not sure, (could be wrong here, I've never looked into selling naked options).

### REPLY:
Ohhhhhh that makes so much sense, I must be retarded. Thanks!

### END.