In 2000 Alameda County voters approved a 1/2% sales tax to fund transportation related projects. The revenue from this was projected to be 1.4 billion dollars over 20 years.
The 2012 Measure B perpetual tax states that it will generate 7.8 billion dollars over 30 years. Measure B is combination of adding the previous tax of 1/2% and Measure B 1/2%.
So lets say the 2000 measure was taken out to 30 years. Instead of 1.4 billion it would have generated 2.1 billion. Doubling this number gives 4.2 billion.
Where does MTC get that Measure B will generate 7.8 billion dollars, especially when sales receipts have actually fallen?