The local intelligence and security agencies are quick to label a person as having black money if all the money is not spent in the city, they forget that if the person is travelling and shopping elsewhere, the cash will be used up.
In goa, there is very less manufacturing compared to metro cities like Mumbai, which has a large number of industrial estates, factories in its vicinity.
So it is possible to purchase a large number of items in Mumbai at a very low price, which are factory rejects or sold at a discounted rate.
For example in Goa, the cost of a plastic mug is Rs 20 or more , however in Mumbai, there were many sellers, who could supply plastic mugs for Rs 10 of good quality
Incense sticks or agarbattis will cost at least Rs 10 for a pack in goa, while in Mumbai after doing a lot of research, it is possible to get 3 packs for Rs 10
So some amount can be saved by the broke domain investor, doing some shopping in Mumbai, especially for lightweight items, which can be easily carried