The products are poorly constructed; ergo, they break easily.
<according to that line of reasoning, the eyewitness couldn't identify the aircraft, ergo it must have been from another planet>
There's no win-win situation for workers of the world, in the current era at least. American steelworkers here do better, ergo Russian and South Korean steelworkers overseas do worse. —Alexander Cockburn, Nation, 3 Jan. 2000
He that comforts my wife is the cherisher of my flesh and blood; he that cherishes my flesh and blood loves my flesh and blood; he that loves my flesh and blood is my friend; ergo, he that kisses my wife is my friend. —William Shakespeare, All's Well that Ends Well, 1603