In an alternate timeline, someone noticed AJ's lewd drawings were quite good. What's more, she realised ponies were willing to pay a good sum for them.
This starts a bootleg drawn porn market that secures the Apple family's future in Ponyville.

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“Here's to porn! The cause of, and solution to, all of life's problems.”

This isn't how economics works though...

Um... what now? Quality? Farm equipment IRL has lead to better quality than things harvested 'by hand' IRL.

Oh well... it's fantasy... I can give it a pass.

Good story.

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Farm equipment IRL has lead to better quality than things harvested 'by hand' IRL

Have you even watched "The Super Speedy Cider Squeezy 6000" episode?

“This red line is consumer demand,” Applejack explained. “When our granny had laid the foundation of this farm, the town was small and its demand for apples was smaller still. But as it continued to grow, more ponies became (began) settling down here, their demand for apple products becoming as diverse as their (the) cultures they had come from. And finally, after Twilight has become a princess and erected her castle, more than ever ponies are now moving to our town to build a life here, ….(and)….some of them are farmers.” Applejack’s brows drew inwards, hard grooves cutting into the bridge of her nose. “We’re already beginning to lose some of our most loyal customers to them because we can’t meet deadlines. In my estimation, we have ten, maybe fifteen years if we’re lucky to rectify the situation and catch up with the demand.”

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If only that were true.

It's a solid enough premise but they are way too nonchalant about this. If Applejack and Applebloom are in heat then they should be all over Big Mac's cock. Not even a hint of forbidden pleasure from incest or excitement for their first impregnation. There needs to be more seduction and passion.

Plus, Applejack isn't the type of pony to let something like estrus stop her from getting out there in the fields.

Before them, Applejack stood in front of a white canvas scattered with pictures and charts and numbers Big Mac was too tired to process. Most likely something to do with profits and such.

Usually Big Mac does the math.

It depicted a red stallion with an orange mane mounting a mare with a cowboy hat from behind.

Couldn’t they ask from help from their cousins or go to a fertility doctor?