Prophets SAW'S prayers.

When entering the Market
Recite:
لَا إِلَهَ إِلَّا اللَّهُ وَحْدَهُ لَا شَرِيكَ لَهُ لَهُ الْمُلْكُ وَلَهُ الْحَمْدُ يُحْيِي وَيُمِيتُ وَهُوَ حَيٌّ لَا يَمُوتُ بِيَدِهِ الْخُيْرُ وَهُوَ عَلَى كُلِّ شَيْءٍ قَدِيرٍ
"There is none worthy of worship besides Allah. He is all by Himself. He has no partner. His is the Kingdom, to Him is all praise. He gives and takes life. He is all by Himself. He will not die. In His hands is all good and He has control (power) over all things".
It is stated in the hadith that if a person reads the above dua in the market place, Allah writes ten lakh rewards for him and forgives ten lakh sins and raises his status by ten lakh and a house is prepared for him in Jannah.
N.B. one lakh = 100,000 (Tirmidhi, Ibn Maja)