缩网址：
http://goo.gl/vjNb2x
原网址：
http://www.nyxdata.com/nysedata/asp/factbook/viewer_edition.asp?mode=tables&ke
y=50&category=8
Margin Debt类似我国的“融资余额”，是所有融资户向证券公司借钱玩股票的负债总额。
Free credit cash accounts，一般帐户的闲置资金。
Credit balances in margin accounts，信用交易帐户的闲置资金。
英文解说：
==Margin Debt==
NYSE member organizations are required to report monthly their aggregate debits
(amount borrowed by customers to purchase securities) in margin accounts, as
well as aggregate free credits (cash balances) in cash and margin accounts.
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最新数据是2015年六月美股的“融资余额”(Margin Debt)大约5049亿美元，为历史次高。