Decline in oil prices globally was a major reason for the Soviet economy's failure.
Soviet oil revenues fell by more than 40% from 1981-1985 due to a fall in oil prices.
Combined with the drop in alcohol revenues, the Soviet economy made significantly less money from the mid-1980s.
Gorbachev financed acceleration by borrowing from Western countries, resulting in government debt rising from $18.1 billion in 1981 to $27.2 billion in 1988.
Gorbachev invested in energy production, ignoring the advice of his economic experts, which did not lead to greater growth.
Increased debt led to more government spending on interest payments, resulting in less money to spend on further modernisation or to produce consumer goods.
Overall, acceleration did not lead to economic growth but instead caused an economic crisis.