Thriller & Bad were bigger.

Also, Janet has like 3 albums that compete

duh

NO

Yes.

No

It's up there.

The inflation

Obviously it's not

Yes

These are the most realistic sales :

1. California Gurls - 10M
2. Teenage Dream - 8M
3. Firework - 11M
4. E.T. - 7.5M
5. Last Friday Night - 6M
6. The One That Got Away - 4M
7. Part Of Me - 4.5M
8. Wide Awake - 5.5M

Although I agree with most of the numbers the OP posted, E.T. was a huge hit only in the US, where it sold ~5.8M copies. It wasn't even a big hit in Australia like her other TD singles (CG - 6x P, TD - 6x P, Firework - 9x P, WA - 6x P). There is NO way it sold 9M copies WW.

TD is the biggest digital era when it comes to singles. But only cuz it had that many singles.

When we compare it to other huge eras with less singles :

The 2 closest eras to TD are :

2. Lady Gaga - The Fame

1. Just Dance - 11M
2. Poker Face - 15M
3. LoveGame - 5M
4. Paparazzi - 6.5M

&

3. Adele - 21

1. Rolling in the Deep - 16M
2. Someone Like You - 11M
3. Set Fire To The Rain - 8M
4. Rumor Has It - 4M

Both of this eras had huge album sales, so it's impressive both managed to have multiple singles bigger than the biggest single of the TD era (Firework).

Yes

Yes, of course! Whoever differs are delusionals. Queen.

Nicely said.

Because not every era can have each single sell 2.8M in the US alone if Katy's singles were selling, why would Capitol stop? espeically if each single peaked in the Top 3 and 6 of the 8 peaked at #1.

PS: Your Gaga numbers are inflated and Adele too.

How did E.T sell 9m? I mean it was released during 2011 but it didn't make the top 10 of the best selling digital tracks of 2011 and the lazy song was at #10 with more than 6m copies sold.

And the one that got away, wide awake and part of me didn't sell that much.

D&H had bigger singles despite what ATRL might think.

Just the way you are: 12.2m reported in 2011, now it's close to 14m.
Grenade: 10.8m in 2011, close to 12m.
The Lazy Song: 6.5m in 2011, so it should have surpassed 7m by now, and this is without counting the music video streams for these songs especially The Lazy Song which has already hit 700m views.
Marry You: I am pretty sure it has surpassed the 6m mark WW.

Atlantic reported last year that D&H has sold 45M singles WW which is impressive considering the fact that only three singles recieved music videos and more than one performance.

No. There's been so many albums in the 21st century that have had much bigger impact than Teenage Dream the album. Era and singles, yes. The album itself no. 1989 and 21 in recent years literally have had much bigger impact as an album. The Fame, Let Go, Breakaway were all bigger hitting albums, with bigger sales than Teenage Dream, and hit a more WW audience on a bigger scale such as Japan, and South America - yes Katy is big there but like the other albums named that have as huge impact as other markets. Single wise in the U.S. yes. WW scale, and just general album impact, it doesn't even hit close. It's disposable with exception to the singles.