A Dua Before you go to the market

Whenever the holy prophet Muhammad (P.B.U.H) went from home to the market, he used to say: 

اَللّهُمَّ اِنِّي اَسْأَلُكَ خَيْرَ هَذِهِ السُّوقِ وَ خَيْرَ مَا فِيهَا وَ أَعُوذُ بِكَ مِنْ شَرِّهَا وَ شَرِّ مَا فِيهَا. اَللّهُمَّ اِنِّي أَعُوذُ بِكَ أَنْ أُصِيبَ فِيهَا يَمِيناً فَاجِرَةً أَوْ صَفْقَةً خَاسِرَةً.

O God! Verily, I ask you for the goodness of this market and every goodness that is in it, and I seek refuge from its evilness and every evil that is in it. O God! Indeed, I take refuge to you from any false oath or harmful deal.