Final answer:
The author used social disorganization theory to analyze the effect of payday lenders on crime rates. Neighborhood variables strongly predicted crime rates, and the presence of payday lenders worsened crime rates over time.
Step-by-step explanation:
Craig and Lockhart's theory conclusions were not specifically mentioned in the provided information. However, the text mentioned that the author used social disorganization theory to analyze the effect of payday lenders on crime rates.
According to this analysis, neighborhood variables like the percent of young males, jobless rate, residential instability, and population density strongly predicted crime rates. Additionally, the addition of specific businesses or institutions, such as payday lenders, worsened crime rates significantly over time.