0th level Cleric/Druid spells(Orisons if you must)
Create water- Only significantly economy shaking in a desert environment, and even then minimally so with only 2 gallons.
Cure Minor Wounds- Maybe used in emergencies, could improve the quality of life but economically unimportant.
Detect poison- Infinitely valuable to any unloved High class citizens, they would pay a hefty sum to be able to tell if their beverage was deadly.
Light- Valuable in low wood areas, but not very due to low duration.
Mending- High value, even a minimal amount of clerics would quickly outdate the repair industry and many smiths.
0th level Bard/Wizard/Sorcerer spells (Cantrips, I guess)
See Light and Mending in the Orisons list