R31 : market-directional meaning, actual, message, 180

Iginla2010

I am sorry to repeat this message since I was suggested to break down my questions posted before. Please refer to V4 of CFAI text.

1. 2nd pargraph on P167
..., many investors consider mortgages to be "market-directional" investments .....

Can any one clarify the actual/clear meaning of "market-directional" ?

2. P180

Why the Duration Hedge (refer to 1st table on 180) is market-directional and the Two-Bond Hedge (refer to 2nd table on 180) is not market-directional ? How to judge ?

Your help will be appreciated !