By Greg MA Hirt, Global CIO, Multi Asset, AllianzGI | Last week Silicon Valley Bank (SVB), a bank that specialized in the financing of technology start-ups, came under tremendous difficulties due to massive mark-to-market losses on its portfolios of long-duration bonds, triggering a wave of deposit outflows. This was followed by high market volatility – especially in the US banking sector – with S&P 500 banks shedding more than 15%…