When the stock price follows a random walk the price today is said to be equal to the prior period price plus the expected return for the period with any remaining difference to the actual return due to: a. A predictable amount based on the past prices.
b. A component based on new information unrelated to past prices.
c. The security's risk.
d. The risk free rate.
e. None of the above.

An insurance company estimates the probability of an earthquake in the next year to be 0.0015. the average damage done to a house by an earthquake it estimates to be $90,000. if the company offers earthquake insurance for $150, what is company`s expected value of the policy? hint: think, is it profitable for the insurance company or not? will they gain (positive expected value) or lose (negative expected value)? if the expected value is negative, remember to show "-" sign. no "+" sign needed for the positive expected value