Bond yields in the currency bloc remain on a downtrend as demand from the central bank continues to drive up prices. Yields fall when prices rise.
Meanwhile, Germany's blue-chip DAX soared to a new all-time high of 12,374 points end of last week on the back of extra liquidity in the euro zone. Year-to-date, the index is up over 20 percent.
In Asia, stimulus hopes and surging inflows from the mainland propelled markets in China and Hong Kong to fresh seven-year highs in early Monday trade.
Japan's Nikkei 225 remains just a whisker below the 20,000-point mark, after breaking through the psychologically important milestone for the first time in 15 years last Friday. Analysts say the benchmark index is well poised to claim another multi-year high.
"The Nikkei caught stage fright when it briefly crossed 20,000, but still looks extremely well bid on macro differentials, demand from Asian neighbors and currency tailwinds to earnings," Evan Lucas, IG's market strategist, wrote in a note.
With that, tell us which market do you think is most at risk of hitting bubble territory?