Why do voters have more power in democracy than in a autocracy

It is because their vote matters and they are free to express their opinion in public. They can be more influential on decisions in society and this gives them more power.

People who live in autocratic governments don't have any rights to choose leaders or vote on which laws are made and put into
practice. 

The price of oil and inflation are connected in a cause and effect relationship, that is, when the price of oil increases, inflation also increases in an economy. this is because, oil is a major input in the economy, that is, it is used for critical purposes such as fueling of vehicles for transportation, for running of industrial generators and machines, for heating homes, etc.for instance, if the price of oil increases in an economy, it will increase the cost of production for those using the oil in their production processes and they will automatically increase the cost of their products in order to offset the extra costs. this leads to general increase in the prices of products in the market and result in inflation.