By Daniel Kline The top 2 mid-tier family cruise lines, along with rivals including MSC, have an issue that’s good for consumers (but maybe bad for investors). Americans have gotten nervous about the economy. Prices have gone up on housing, cars, food, gas and pretty much everything else. And, while the jobs market has generally been strong and some of those rising prices have stabilized, or even dropped a little, it’s fair to say that more people are being cautious about how they spend money. That does not mean consumers have cut all discretionary spending. After roughly two years of pandemic…