Carnival stock has seen a 19% increase over the past year, but its value has also slipped in recent months, with some outlets reporting a 19% decline in the last three months and a 22% drop from its 52-week high. The stock's future valuation is uncertain, with targets ranging from $17 to $35 or even $40 by 2027. The cruise industry as a whole appears to be experiencing volatility, with other cruise line stocks also moving in different directions.