Nowadays there is no doubt the main occupation was commerce, industry and trades.
Dubnov writes of 966 'Jewish merchants using the great trade-route (the Baltic and the Vistula, H.R.) did not pass over Poland'. Of the 12th century Dubnov asserts: '...Mieczyslaw who needed revenues, made use of the Jewish industry in all professions'. In the 15th century, writes Shipper (History of Jewish commerce 517), the way of commerce reopened for the Jews.
They brought ash, tar, grain (from Russia H.R.) and shipped them to Danzig via Volinia and Mazowia'. We may suppose, therefore, Jews came to Poland-Mazowia for economic reasons brought about by persecutions of a background of religious and economic jealousy, but also for considerations of sale combinations. When the need arose to get rid of merchandise apt to get spoiled along the long route, or in order to safeguard the prices, or when obstacles happened en route, merchants might sell in temporary or occasional markets, put up booths or shops on their passage, and workshops even, for carrying out various processings and treatments of the products. Thus there arose a connection between German Jews and Polish towns (Mazowia in particular H.R.), and '...in the 11th and 12th century already Jews occupied an important position in the economic life of Poland, being the factor of financial economics in this country'. And '...many Jews in Poland were engaged in a small-income livelihood, as farming and gardening' (Shipper, ib).
Casimir the Great published in 1364 a decree, saying' 'The King has granted the request of the Jews living in all the Polish towns.. in order do enlarge his royal revenue by their incomes' they are granted: '...freedom of trading, the right to import and to expert merchandise, and also to lend money on interest, pawn or mortgage.' As aforementioned, we infer that Vishogrod is included whenever Mazowia is the matter, firstly because Vishogrod was the wealthiest town in the whole district, as Levinson says' '...in the lending business the Jews of Vishogrod were outstanding' (1347 H.R.). '...In order to carry out large credit operations, small Jewish bankers (of Warsaw H.R.) associated with the rich men of Vishogrod in co-operatives'. ('The history of Jews in Warsaw'). Secondly, because Vishogrod was privileged with a status of independence, and all those who verify their researches with 'Deeds of Kings' will not find there Vishogrod.
Besides commerce, finances and agriculture Vishogrod was known for its craftsmen. In the 16th cent. already, 'Sigmund III confirmed their corporations in the town', and that Jews are meant there, we learn from the anonymous pamphlet published in 1539'..and there he states that in Poland there are scarcely any Christian craftsmen, and the Jewish craftsmen are the triple number of the Christians' (A. Levinson, ib). When Shipper is speaking of 'Jewish gardeners and farmers,' it is to be taken for granted that Vishogrod Jews are to be included. As shown in the writings of those participating in the memorial book, gardening had been kept up until their times, without interruptions as it seems. '...in the 17th cent. Vishogrod was renowned for its superb orchards and vineyards' (Univ. Encycl.)