The minimum size (bar) of a deal that a investment bank will accept to handle. The bar can be based on either potential fee or potential deal amount. For example, most bulge brackets tend to handle deals worth $300 million or more in size. Of course, the bare can change across markets and from time to time. In normal market conditions, bulge brackets prefer deals larger than $1 billion. Small and mid-size firms may accept bars as low as $25- $50 million. In general, small deals require as much efforts as large deals and generate lower fees, therefore, banks prefer spending their time and resources on mega deals, rather than small ones.