In: Economics
Attacks on sellers means that sellers production of a good or service is being affected due to outside forces. The attack could be natural like drought or tsunami in the country which destroys the crops and thus decreases the production of a good and as a result the supply is reduced in the economy. Other type of attacks could be from human like entry of new competitors of substitute goods. As more substitute goods are available in the market the supply of the good is reduced due to more options to produce.
Such attacks on sellers decreases the supply in the market and as a result the supply curve shifts leftwards.