Why does a 2% dip in a house price wipe out 10% of a 20%-down buyer's equity, and why can't a zero-net-investment position have weights?
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The 130/30 portfolio
Write the weights of a 130/30 fund, show how a 30% cap on shorts at 100% net exposure caps longs at 130%, and record the long-only restriction on institutions it relaxed.
Mortgage leverage: house , mortgage
Compute both weights for a $500,000 home bought with 20% down, state the 5:1 leverage ratio, and work out the equity lost to a 2% and a 15% price fall.
Zero-net-investment portfolios
Write the long-A, short-B example with $5,000 on each side, show that the weight denominator is zero, and record that such positions are stated in dollar amounts instead of weights.