My point exactly. In a chart of world gross domestic product for the last 12 months, when was it at zero? In a chart of ocean salinity, when was it at absolut

My point exactly. In a chart of world gross domestic product for the last 12 months, when was it at zero? In a chart of ocean salinity, when was it at absolute zero? Is it inherently deceptive to use a y-axis that doesn't begin at zero?