It will make people have to take less time out of their day to do their shopping making them happier and as a result of this much more productive at work, and so enabling the economy to grow.
I want you to imagine the situation, you walk in your supermarket on your way home from work, you've had a busy day, but need to pick up a few items for your evening meal. You walk in, your head drops with disappointment, yet again you go in to find it incredibly busy and you know it's going to take a while to get to the aisles you want, let alone actually get to the checkout to pay.
What makes it worse is the realisation that the supermarket is not full with other people in similar positions who have been at work (yes there are some), but there are large numbers of old people, and young ladies with their babies wandering through debating what they need, not rushing feeling they have all the time in the world, without a second thought for the fact you just want to get back home and eat and relax after a stressful day at work.
I therefore, must propose that a law be brought in that prevents people who do not work in the day from using supermarkets during lunchtime hours, and between 17.00 and 20.00. A small sacrifice for them, that enables people who cannot go during the quieter hours of the day due to work commitments, to be able to do their shopping quicker, and hence improving the efficiency of the country as a whole.