Online retailer Amazon on Thursday disappointed Wall Street with its outlook for the current quarter, causing shares to fall by more than 4% in after-hours trading. Amazon forecasted net sales of between $154 billion and $158.5 billion for the current quarter, falling short of analysts’ average expectation of $158 billion. In the second quarter, Amazon’s net sales increased by 10% year-on-year to around $148 billion, also below market expectations. However, the company exceeded estimates with its cloud division AWS, with sales increasing by 19% to $26.3 billion, surpassing analysts’ forecast o…