Which policy did Gorbachev implement to reform the Soviet economy alongside glasnost?

Gorbachev implemented perestroika as a policy to reform the Soviet economy, alongside glasnost, which emphasized openness and transparency in government. Perestroika, meaning "restructuring," aimed to revitalize the Soviet economy by introducing elements of market economics, increasing efficiency, and encouraging some level of private enterprise. This shift was intended to address the stagnation and inefficiencies that were prevalent in the planned economy of the Soviet Union, promoting a more flexible approach to economic management.

While other options may relate to economic contexts, such as Soviet Isolation which suggests a focus on isolationist policies, or Reaganomics which refers to economic policies in the U.S. under President Reagan, they do not pertain directly to Gorbachev's specific reforms in the Soviet context. Market Control does not accurately capture the transformative nature of perestroika, which actively sought to move away from strict state control towards accommodating market dynamics. Thus, perestroika stands out as the correct answer due to its explicit focus on economic restructuring in conjunction with glasnost.