Which of the following events would correctly describe the outcome in a competitive market?

a	An increase in supply, ceteris paribus, causes an increase in equilibrium price and quantity.
b	An increase in demand, ceteris paribus, causes a decrease in equilibrium price and quantity.
c	An increase in demand, ceteris paribus, causes an increase in equilibrium price and quantity.
d	An increase in supply, ceteris paribus, causes an increase in equilibrium price and a decrease in equilibrium quantity.
e	A decrease in demand, ceteris paribus, causes an increase in equilibrium price but an indeterminate change in equilibrium quantity.