Airline ticket prices increase 15 days before the flight date

Earlier the airline ticket prices would increase a week before the journey date, however in the last few months, the ticket prices are increasing drastically 15 days before the journey, forcing the traveller to book the tickets well in advance.
For example the cost of goa-mumbai ticket will be around Rs 2000 15 days before the journey date, however 13 days before the journey date, the airline ticket price will increase drastically to Rs 3500 or more
So anyone who wishes to travel by air is forced to either pay a large amount for last minute booking or book their tickets well in advance which can be extremely risky, especially for small business owners who have to pay their own expenses.