4.3 Development of Bond MarketBangladesh Bank has now engaged itself in the open market operation very actively and hasintroduced its own securities, such as 90-days Bangladesh Bank Bill since 1990. Later on 30-days Bangladesh Bank Bill has also been introduced in 1995 alongwith 90 days, 180 daysand one year maturity Treasury Bills with active participation by commercial banks. Auctionis now held every week.