Inflation is the increase in the prices of goods and services across an economy. When prices inflate, you need more money to buy the same things. The opposite of inflation is deflation, when prices are lower across a range of goods and services.
James Howell, a 17th century historian cum writer was the first writer to earn his living from writing alone in the English language; other writers of those times pursued writing as a hobby, not a profession as writing alone never paid enough.
The Gremlins has a very good claim to being Roald Dahl's first piece of writing for children. It is certainly one of the first stories he ever wrote. He began work on it in 1942, soon after his first paid piece of writing, Shot Down Over Libya, was published in the Saturday Evening Post.