      The NYSE also requires that a broker, before proceeding with a cross,must make a public bid and offer on behalf of both sides of the cross. Thisrule was established to allow other brokers to match the stock bid for oroffered by the broker who would like to cross. When a broker does, in fact,put up a bid and ask with intention to cross, he may do so with a minimumvariation spread. Orders may therefore be crossed at or inside theprevailing quote. Orders of 10,000 shares or more ("blocks") may be crossedoutside the prevailing quote.15 However, when a broker wants to cross anorder, he is required to bring both sides of the stock to the tradingcrowd. He must also observe the market's principles of bid and offer parityand precedence.