Why does a correlation of −1 promise a riskless 16% a year, and why does that tell you such stocks don't exist?
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A mix that dominates the least risky stock
Compute the 75% GM, 25% Motorola portfolio (1.25% mean, 6.01% standard deviation) and record how it compares with holding GM alone on both risk and return.
The bullet at
Sketch the four trade-off curves on one graph, compute the 50/50 standard deviation at , and , and describe each shape.
Perfect negative correlation and the zero-risk portfolio
Find the weights that make when , compute its return of about 1.34% monthly, and record the arbitrage argument that rules it out in practice.
Second pair: General Dynamics and Motorola
Repeat the mean and standard deviation calculation for one weighting using GD 0.00%, 9.96%, Motorola 1.28%, 9.33% and .