Yellow is fake gold; it's veneer and show rather than substance. We see that with the yellow cocktail music at Gatsby's party (1) and the two girls in twin yellow dresses who aren't as alluring as the golden Jordan (3.15).
I think a moderate income is income above the median for famlies in your county, but not more than 25% of the median income. The IRS usually has this info for free, but I see they are now charging $10 for this on their web site for more recent years. http://www.irs.gov/taxstats/indtaxst...=96947,00.html.
HUD makes low-income units available to households with annual incomes at 80 percent, 50 percent and 30 percent of their area's median figure. HUD categorizes households at these levels as low income, very low income and extremely low income, respectively. Generally, families at any of the three classifications are eligible for a public housing unit. For Section 8 housing, your household income cannot surpass 50 percent of your area's median income.