15. Which statement below isincorrect?

a.

If the weak form efficient market hypothesis holds, we should not achieve abnormal returns based on technical analysis.

b.

The HML portfolio is a strategy that attempts to buy stocks at high prices and sell them at low prices.

c.

The attention effect is more likely to happen in a lab experiment than in a field experiment.

d.

If a time series variable has an upward trend, it cannot be stationary.