City Tier

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As your city gains population, its tier will eventually increase to the next tier. When the tier increases, the city will unlock various bonuses. The rate of growth to the next tier depends on several factors.

City Tier	Population	Claims	Experts	Amenities	Research	City Production	Tax Multiplier	Food Cost	QoL Cost
1	300	0	0	0	0	2	0	1	0
2	500	1	0	1	1	4	0	2	0
3	1100	2	0	2	2	5	1	4	0
4	2400	3	0	2	4	6	2
5	4000	4	0	3	6	7	4
6	8000	5	1	3	8	8	8
7	12000	6	2	4	10	9	12
8	16000	7	3	4	12	10	16
9	20000	7	4	5	14	11	20
10	30000	8	5	5	16	12	25
11	40000	9	7	6	18	13	30	80	25
12	50000	10	9	6	20	14	35	100	30
13	75000	10	11	7	22	15	40	125	35
14	100000	11	13	7	24	16	45
15	150000	12	15	8	26	17	50
16	200000	13	17	9	28	18	55	200	50
17	250000	13	19	10	30	19	60	225	55
18	300000	14	21	11	32	20	65	250	60
19	350000	15	23	12	34	22	70	300	65
20	400000	15	25	13	36	24	75
21	450000	16	28	14	40	26	80	400	80
22	500000	17	31	15	45	28	85	450	90
23	750000	17	34	16	50	30	90	500	100
24	1000000	18	37	17	55	32	95	600	110
25	1500000	19	40	18	60	34	100	750	125
26	2000000	20	43	19	65	36	105	900	140
27	3000000	21	46	20	70	38	110	1100	165
28	4000000	22	49	20	75	40	115
29	5000000	23	52	20	80	45	120	1500	200
30	7500000	24	57	20	100	50	150	2000	200

Claims

The number of claims a new Region costs depends on the distance from the city center.

Experts

Most Improvements have 1-3 expert slots in which you can place an expert to get various bonuses.

Amenities

Amenities typically provide stat bonuses to your city's Quality of Life. Some of them provide maluses or unique bonuses. Once an amenity is placed, 1 of that amenity is drawn from the supply every X turns.