Answer:
new technology for freezing food
Step-by-step explanation:
The graph shows a decline in demand for meals served between 2007 and 2008.
People can feed themselves in two ways, buying frozen food or buying food served at restaurants. In this way, we can say that these two forms of feeding are substitutive. If new technology allows frozen food to last longer, people can substitute meals served with frozen meals. This explains the decrease in demand for meals served, seen through the shift to the left of the demand curve on the chart, from 2007 to 2008.