Caused many political disputes, caused a lot of waste.
I find the media the most important because their role is to inform, criticize, and stimulate debate.
The main reason why Spain decided to support Columbus' voyages of exploration was because he promised that he would bring gold and spices back from the New World. Another reason was that the Spanish Crown was interested in spreading Christianity.
A centrally planned economy oppose these basic economic characteristics- Property owned by private individuals, Market pricing determination by supply and demand forces, encouragement of competition among the companies and providing a wide range of choice to consumer.