Apple (AAPL -2.41%) shares have advanced 34% during the past year, but that upside has been driven almost entirely by valuation multiple expansion rather than earnings growth. Consequently, some Wall Street analysts have turned bearish on the stock in the last couple of weeks.Tim Long at Barclays recently initiated coverage on Apple with a sell rating and a target of $184 per share. That forecast implies 24% downside from the current share price of $243.Tesla (TSLA -0.05%) shares have advanced 66% over the ...