years. The nobles kept nearly all the meadows and forests, had their debts paid by the state while the ex serfs paid 34% over the market price for the shrunken plots they kept. This figure was 90% in the northern regions, 20% in the black earth region but zero in the Polish provinces. In 1857, 6.79% of serfs were domestic, landless servants who stayed landless after 1861. Only Polish and Romanian domestic serfs got land. 90% of the serfs who got larger plots were in Congress Poland where the Tsar wanted to weaken the . The rest were in the barren north and in Astrakhan. In the whole Empire, peasant land declined 4.1%, 13.3% outside the ex Polish zone and 23.3% in the 16 black earth provinces. These redemption payments were not abolished till January 1, 1907. Impact A 2018 study in the American Economic Review found "substantial increases in agricultural productivity, industrial output, and peasants' nutrition in Imperial Russia as a result of the abolition of serfdom in 1861". Serf society Labour and obligations In Russia, the terms () or (), refer to the obligatory work that the serfs performed for the landowner on his portion of the land (the other part of the land, usually of a poorer quality, the peasants could use for themselves). Sometimes the terms are loosely translated by the term corvée. While no official government regulation to the extent of existed, a 1797 ukase by Paul I of Russia described a of three days a week as normal and sufficient for the landowner's needs. In the black earth region, 70% to 77% of the serfs performed ; the rest paid levies (). Marriage and family life The Russian Orthodox Church had many rules regarding marriage that were strictly observed by the population. For example, marriage was not allowed to take place during times of fasting, the eve or day of a holiday, during the entire week of Easter, or for two weeks after Christmas. Before the abolition of serfdom in 1861, marriage was strictly prohibited on Tuesdays, Thursdays, and Saturdays. Because of these firm rules most marriages occurred in the months of January, February, October, and November. After the emancipation the most popular marrying months were July, October, and November. Imperial laws were very particular with the age in which serfs could marry. The minimum age to marry was 13 years old for women,