Alexander expanded the bureaucratic system by creating the "Council of the Voivode", the Chancellory and by adding (in 1403) the institution of Logofăt – Chancellor of the official Chancellery.

During his reign, he introduced new fiscal laws by adding commercial privileges to the traders of Lviv (1408) and Kraków (1409), improved the situation of trading routes (especially the one linking the port of Cetatea Albă to Poland), strengthened the forts by guarding them and expanded the Moldavian ports of Cetatea Albă and Chilia.

[3] The main concern of Alexander the Good was to defend the country in wars against superior armies.

[citation needed] Due to a territorial claim of Poland and the previous failure of the Polish king to fulfill his part of the vassalic treaty during an Ottoman attack in 1420, Alexander launched an attack on Poland during the Lithuanian Civil War.

Alexander had a number of wives: Margareta Bánffy de Losoncz, Ana Jagiellon of Podolsk, Rimgailė (daughter of Kęstutis and sister of Vytautas the Great; divorced in 1421).