There are now twice as many people in the household, but your income has also doubled. Is your new tax liability about twice as much as when you were single, more than twice as much, or less than twice as much? Tell whether you think this difference- or the lack of one- seems fair

It is fair because due to marriage the resources tends to accumulate and thus the common expenses like living housing eating costs goes down than they were sustaining when they were not married.

Explanation:

Solution

It will result in higher tax due to the marginal rate rising due to increase in income plus due to joint filing after marriage.

The difference seems to be fair from the point of view that due to marriage the resources become pooled and thus the common expenses like living housing eating costs come down than they were incurring when they were single. Hence, they can now afford to pay higher taxes and it kind of does seem fair.

the answer to this question would be shared investment