Munis saw gains in spots on Monday, as U.S. Treasuries richened and equities ended stronger. UST yields richened by four to five basis points. The price of oil has decreased significantly from last week, Iltz added. Muni investors are armed with heavy redemptions this week, and issuers are set to supply more than $18 billion, Iltz said. "That will determine a lot of the environment for this week in terms of how receptive the market is."