Box Spread Options and the Implied Loan Rate
A box spread is a synthetic zero coupon loan built from four options. See how the payoff locks to the strike width and how to solve for the implied loan rate.
#put-call parity
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Put-Call Parity Explained, With Real Numbers
Put-call parity is the fixed link between a call, a put, the stock, and cash. Worked on a real option chain, plus the implied dividend and borrow rate.