Apple Inc. unveiled a new, smaller iPhone that will start at $399, seeking to jump-start sales of its flagship product by enticing more users to upgrade, especially in high-growth markets such as China and India. The iPhone SE has a 4-inch-screen, comes in four stainless-steel finishes, and incorporates the faster A9 processor that also runs the larger iPhone 6S handsets. JPMorgan Chase Global Market Strategist David Stubbs discusses the release and the outlook for tech with Bloomberg’s Anna Edwards and Manus Cranny on “countdown.”