The Borsa Istanbul opened the week with a decline, as the BIST 100 index fell by 0.32 percent. The index began trading at 13,936.16 points, signaling a negative start to the week for investors. This decrease reflects a shift in market sentiment following [mention potential reasons if available in context, otherwise omit]. Analysts are closely watching market developments to assess the potential impact of [mention potential factors, omit if unavailable]. The decline is relatively modest, but warrants attention from those tracking Turkish financial markets. Further market fluctuations are anticipated as the week progresses, influenced by both domestic and international economic indicators. Investors will be looking for signals of recovery or further decline in subsequent trading sessions.