How should money be divided in a seriously committed relationship in which both partners have income?

The couple should merge all of their money

Each individual should have both separate money and joint funds

The individual with a higher income should have some of his/her own money, contribute to the joint fund, and give the other some extra money.

The individual with a higher income should have some of his/her own money, but contribute more to the joint fund.

Each individual should maintain separate money

Other

The couple should merge all of their money

Each individual should have both separate money and joint funds

The individual with a higher income should have some of his/her own money, contribute to the joint fund, and give the other some extra money.

The individual with a higher income should have some of his/her own money, but contribute more to the joint fund.

Each individual should maintain separate money

Other