China has an old saying, "mount a mountain, pull a water". The poor people of Ji'nan, of course, have to rely on springs for spring. The most direct thing is "selling water in springs".
the old Ji'nan City, along the edge of the spring there are many bean sprouts, tofu square, wine shop,... All the businesses that need to moisten with spring water are mostly located beside the spring side river.
coriander radish washed and sold again. How much more can you sell?