Question

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1.$ Sarah makes a value weighted portfolio of three securities. At time the prices of Apple,...

1.$ Sarah makes a value weighted portfolio of three securities. At time the prices of Apple, Walmart, and Netflix are $70, $20, and $100. The shares outstanding are 83, 71, and 84, with time 1 prices of $80, $10, and $120. What is the percent change in a value weighted index of these shares from time 0 to time 1?

2. Joe invest $10000 to construct an equally weighted portfolio of three securities. At time 0 the prices of IBM, Exon, and Costco are $80, $30, and $125. At time 1, the prices are $90, $70, and $130. After rebalancing to keep equal weights in each company at time 1, how many shares do you hold of each stock?

Solutions

Expert Solution

1) The value of index at time 0 = price of apple in time 0 *number of shares of apple +price of walmart in time 0 *number of shares of Walmart+price of Netflix in time 0 *number of shares of Netflix

=70*83+20*71+100*84

=15630

The value of index at time 1 = price of apple in time 1 *number of shares of apple +price of walmart in time 1 *number of shares of Walmart+price of Netflix in time 1 *number of shares of Netflix

=80*83+10*71+120*84

=17430

Percentage change in value weighted index is given by

((Value of index at time 1-Value of index at time 0)/Value of index at time 0)*100

=((17430-15630)/15630)*100

=11.516%

2) for a equally weighted portfolio amount invested in each stock = $10000/3 = $3333.33

at time =0

Number of shares of IBM= Amount invested in IBM/ Price of IBM= 3333.33/80= 41.67 shares

Number of shares of Exon= Amount invested in Exon/ Price of Exon= 3333.33/30= 111.11 shares

Number of shares of Costco= Amount invested in Costco/ Price of Costco= 3333.33/125= 26.67 shares

The value of index at time 1 = price of IBM in time 1 *number of shares of Costco +price of Exon in time 1 *number of shares of Exon+price of Costco in time 1 *number of shares of Costco

=41.67*90+111.11*70+26.67*130

=14995.1

for a equally weighted portfolio amount invested in each stock = $14995.1/3 = $4998.367

at time =1

Number of shares of IBM to be held after rebalancing= Amount invested in IBM/ Price of IBM= $4998.367/90= 55.54 shares

Number of shares of Exonbe held after rebalancing= Amount invested in Exon/ Price of Exon= $4998.367/70= 71.41 shares

Number of shares of Costcobe held after rebalancing= Amount invested in Costco/ Price of Costco= $4998.367/130= 38.45 shares

(therefore number of shares to be bought for IBM = 55.54-41.67= 13.87 shares

therefore number of shares to be Sold for exon = 111.11-71.41= 39.70 shares

therefore number of shares to be bought for Costco = 38.45-26.67= 11.78 shares

Note: it is assumed that shares can be bought in decimals. )


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