That is the Preamble to the Constitution which is:
"We the People of the United States, in Order to form a more perfect Union, establish Justice, insure domestic Tranquility, provide for the common defence, promote the general Welfare, and secure the Blessings of Liberty to ourselves and to our Posterity, do ordain and establish this Constitution for the United States of America."
This change in price means that there is a shortage of lettuce and the price of tacos will increase. That if tacos are made with lettuce and everything else remains constant (ceteris paribus).
