In his book, The Logic of Life, the author, Tim Harford discusses the sensitive subject of marriage, applying economic theory.

He explains that there is interplay of three factors- economies of scale, division of labour and comparative advantage, in assigning roles and responsibility in a marriage.

Let start with the male parent. For the sake of this discussion, let us give him a short and sweet name, say, Raj. And, let us refer to the female parent as – here we will let our imagination go wild- the “wife”. For the sake of convenience, we will drop the inverted commas and call her simply as the wife.

Now, let’s say that these two parents- Raj and wife- have two daughters who are growing up and need attention. Lunch bags have to be packed, pencils need to be sharpened, pens need to be inked, rulers have to be scaled, etc. So, money has to be earned to buy all these things and energy expended in managing the tasks that these things are meant for.

Adam Smith’s principle of division of labour says that each parent must do specialised work, just as in a pin factory, one specialist draws the metal, the other hammers the head, the third inserts them into a piece of paper. Similarly, it doesn’t make sense for each parent to share all the responsibilities equally. Two specialists in respective fields are many times better than two handymen. Make no mistakes, says Tim Harford, marriage is the oldest pin factory of all.

‘A household in which both parents work part-time on their careers and part-time looking after children and the home does not make rational economic sense. Two halves are much less than a whole. Economies of scale dictate that, logically, one partner should apply himself or herself full-time to paid work. The other should work at home-making, and only work for money if there is some spare time available after the household chores. So far this is classic Adam Smith.’

The rule of ‘economy of scale’ dictates that one parent working full time can earn more than two parents working half time each. So, only one parent must go out to work, while the other must get down to household chores. The question is who?

In the hunter-gatherer days and even upto the ‘50s and ‘60s, it was believed that the male parent was better at outdoor work ( and therefore ‘earning’) while the female parent was a specialist at managing household work. But, this was only a partial application of the principle of comparative advantage.

In the case where wife is four times better than husband at house-work and only twice as better at earning money, then it was wrongly concluded that the task of house work should be entrusted to wife. The fact that she was also twice as good in earning money was relegated to the background. ‘The logic of comparative advantage highlighted something that most men—except economists—have found it hard to get their heads around: there is no reason to believe that men were breadwinners because they were any good at it. They might simply have been breadwinners because getting them to help around the house would have been even worse.’

This truth, as we will see, applies to the couple, Raj and wife, who form part of our case study. It so happens that Raj is one of those poor suckers still stuck in an old-economy company, where an increment of 5% in salary, once in a year, is considered par for the course. Whereas wife is in the IT sector, where as is well known, employees go to office only to collect letters from employers that grant them increments once a week, plus stock options encashable once a quarter and a company-sponsored holiday for entire family in an exotic locale once a month.

So, it makes sound economic sense for wife to apportion her time equally between office and home, earning IT money for the family during the day and finishing all the household chores in the evening and night, she offering comparative advantage on both counts.

Now, Raj of this case study has his own strengths. He is a better blogger than his wife and even figured in the top 1000 when Sulekha used to have a ranking system.He is also a better golfer than his wife, and a better badminton player too. So, clearly, the family would immensely benefit from his comparative strengths and should assign him the roles of blogger in the mornings, golfer in the afternoon and a badminton player in the evenings. 

Raj has to make this supreme sacrifice for the sake of his family. and to make it  a sound economic unit, that Tim Harford would approve of. Each parent would perform specialist roles that offer comparative advantages.