Federal Reserve Chair Janet Yellen has an expensive stamp collection. According to Yellen's latest financial disclosure, her stamp collection is worth $15,001-$50,000. Yellen, however, did not appear to sell any stamps, as income related to that asset was listed as none, or less than $201. The disclosure form requires Yellen to list her assets and income, though the amount of each asset held is put into a range bucket, not given a precise figure. A report from Martin Crutsinger at the AP said the value of Yellen's assets — which include stakes in ConocoPhillips, Pfizer, and Office Depot common stock, as well as a number of stock and bond funds — rose 8% in 2013.