Quote from donnap:
I am not disputing this. I am attempting to illustrate a position that fits RFT's description.
Please keep in mind that there is a difference between risk free and risk free of loss. There is also a difference between theory and reality. Reality involves comms, slippage, trading experience and skill, etc.
A conversion is a risk free position - except pin risk.
Collars with offset strikes; the call having the higher strike, may be constructed to benefit from a rise in the underlying and have no risk of loss. But there's still risk - the cost of capital. These are equivalent to bull put spreads and a risk free interest earning investment (principal equal to value of the strike of the long put).
Interest rates are so low it's not easy to find a good, clear example without going out in time. Look at GOOG Jan '09 options. Selling the 480C and buying the 460P can be done for a small debit, say 2 pts at fair prices. The investment would be nearly 46K per collar for about 10 moths.
With GOOG at 457ish there's no risk of losing money and you make about 20 pts.if GOOG ends over 480. I know, big deal, but interest rates are very low. Under 460 you get nothing for your investment.