what are the factors that determine when a substance is toxic and unfit for human consumption
Will become unfit for human consumption
This is already in effect nowadays. The FDA allows companies to sell genetically modified food, which theoretically is unfit for human consumption due to potential health reasons.
Horse chestnut
Public goods are non-excludable and non-rival in consumption whereas Private goods are excludable and rival in consumption.
An Economist studies the production distribution and consumption of goods and services
An Economist studies the production distribution and consumption of goods and services
Consumption of a good by one person decreases consumption by another person.
The phrase "Fit To Be Eaten" can be decribed as "edible". Fit for Consumption may be more appropriate. The opposite being "inedible" or "Unfit for Consumption"
Private Goods
Total consumption spending is comprised of durable goods, non-durable goods, and services. Total consumption spending is a major economic factor in the US economy.
methyl alcohol or methanol