How much was a loaf of Brad in 1975?

$8,710.72

To find the answer, we must first quantify the value of Brad.

So how much is a human life worth? According to research by Stanford economists, a year of human life is worth about $129,000. Wolfram Alpha tells us that the average age of a person named Brad is 35 years, and that the average life expectancy for a human male (worldwide) is about 69 years. Assuming that procuring a loaf of Brad involves cutting down a Brad in his prime, we would be depriving him of 34 years of life - a value of $4,386,000.

Next we must decide if a "loaf" is a unit of volume, or a unit of weight. In the UK, government regulation defines a loaf by weight: 400 grams is a "small" loaf, and 800 grams is a "large" loaf. So let's go with weight, and let's split the difference and assume that we want a medium sized loaf of Brad... that's 600 grams, or about 1.3 pounds.

Since the average weight of a human male is 166 pounds (according to Wolfram Alpha), we can assume that Brad should sell for about $26,421 per pound - which, using our previous loaf weight of 1.3 pounds, sets the price for a loaf of Brad in 2010 at $34,348.

Finally, inflation must be factored in. According to an inflation calculator at westegg.com, what cost $34,348 in 2009 would have cost $8,710.72 in 1975.

Thus, it is safe to say that a loaf of Brad in 1975 could be purchased for $8,710.72.